I'm no fiend. Most nights I'd rather share a bottle of wine with some friends than stay up till 6am getting sweaty and boggle-eyed on a bender. But while I associate alcohol with talking about past experiences, I associate drugs with making new ones. Party drugs can often make a stranger feel like a confidant; a simple trip to a town centre feel like an Enid Blyton escapade.

I probably take class-A party drugs such as MDMA or cocaine once a fortnight, and have done since I was 16 (I'm 27 now). I like the way cocaine gives you a new lease of life, like a mushroom in Super Mario, to carry on with a night out. I like the way MDMA softens the edges of reality and gives you a deep sense of connection to your friends that you can never get when you meet them for dinner and they moan about their jobs. I like how when you're coming down from a pill another person's touch has a comforting, almost electric capacity. If you're suffering from exhaustion, anxiety or stress, recreational drugs can give you a bit of a leg-up.

Drugs can also be a total pain. Ecstasy can make you feel like you're floating in a cloud, but just as often it's an admin nightmare: you come up at different times from your friends; only half the people in a group remembered to get sorted and there's endless hassle at a party trying to get more. Even when you're having a great time, there's a self-doubting internal monologue running through the whole process: Have I done enough? Am I coming up? Do I look like a prick?

I would just like to have that conversation about drugs being sometimes brilliant and occasionally annoying. Yet I feel like there is no one who is willing to talk about drugs in those terms.

When children ask their parents where babies come from, they get a white lie – a stork delivers them, you find them in a cabbage patch, you order them from Ocado. That's the closest thing I can think of to explain the difference between the perception and the reality of drug use by young people in the UK. There is a societal stork myth that is propagated by the media and popular culture to hide a basic reality. Even users themselves are entirely unwilling to talk about drug-taking honestly. Everything in the drugs world tries to stifle this conversation. Take nightclubs. It doesn't take a genius to work out that staying up till 6am listening to dance music at an ear-splitting volume would not only be unenjoyable without some kind of mind-altering stimulant, but a painful test of endurance. Most people in big nightclubs are on drugs. The clubs know that: that's why they charge so much for entry and, often, for bottles of water. They know that not many people will be buying drinks. Most of them have in-house dealers too, so they can sort out their DJs. Bigger DJs put requests for drugs on their rider. "We just put it on expenses as 'fruit and flowers'," a promoter at a major nightclub told me this year. But there's still a stork charade, with the venue covered in posters promising to eject drug users and bouncers searching punters – but not too thoroughly. The pretence is that this could all be above board.

I suppose the reason for this false picture of drug-taking is that most people don't take drugs. The statistics show that only a small fraction of the UK population are regular drugs users, and a smaller fraction still do anything harder than weed. But drug use is not spread evenly across the country, nor across age groups. In my demographic – under 30, living in London, job in the creative industries, disposable income – almost everyone is a recreational drugs user.

Where I grew up in south London, it was pretty uncommon to find someone who didn't at least smoke weed. The children of more middle-class parents were taking cocaine, ecstasy, ketamine and mephedrone almost every weekend. These were not reprobates ruining their lives: they were intelligent, bright people who got three As at A-level and went to good universities.

We would go to raves in places such as Camberwell and Hackney Wick, to warehouse venues where almost no one was over 18. White powders flowed as freely as the Fanta Fruit Twist and Malibu we were drinking. Festivals played a big part, too. Parents, even quite strict ones who wouldn't dream of letting their kids out past midnight, were happy to send their kids to music festivals, perhaps because of the reverent music-focused coverage in the media.

'I remember taking mephedrone with a girl I fancied during Blur's headline set, both weeping with joy at a band we'd grown up with our whole lives.' Photograph: Andy Sheppard/Redferns via Getty Images

If you go to somewhere like Reading or Benicàssim, almost everyone is under 20. Half of them barely leave the campsite. Festivals are drugs playgrounds where teenagers experiment with copious amounts of uppers in presumably quite dangerous combinations. Some of the best moments of my life took place going to festivals as a teenager. I remember one muddy year at Glastonbury, racing down the hill arm-in-arm with a bunch of people, all off our faces on MDMA, feeling happier than I had ever felt. Another year, I remember taking mephedrone with a girl I fancied during Blur's headline set, both weeping with joy at a band we'd grown up with our whole lives.

Again, everyone knows this; no one thinks the thousands who watch the sunrise at the stone circle in Glastonbury every year are just on a high from seeing Mumford and Sons. But the festivals keep up the pretence that they are drug-free zones. Even a recent BBC3 show, Festivals, Sex and Suspicious Parents, which was supposed to show parents what their kids really got up to at festivals, ignored the fact that as the cameras panned around the festival, many revellers were plainly as high as a kite, their jaws swinging back and forth like pendulums, a side-effect of taking ecstasy. The voiceover just kept talking about people being "drunk".

I am also part of the first generation of people whose parents are likely to have been drug users. Of course, some adults would be outraged, like the parents on BBC3, to see what their kids got up to. But many more knew only too well – plenty of people I know would smoke weed or share dealers with their parents. In some families drug use had less stigma than smoking.

I thought all this was normal, but at university I met, for the first time, young people who totally abstained from drugs. They mostly came from outside major cities, or outside the UK, and many shivered in horror when they saw the rest of us dabbing our gums with mysterious white powders. I thought there would be a rift in social lives, an us-and-them situation, but it was around that time that mephedrone happened. Known by literally no young person ever as "meow meow", mephedrone was a legal high that changed attitudes towards drug-taking. Polite do-right kids who would never dream of taking illegal drugs were happy to chow down on bombs (self-made wontons of mephedrone powder wrapped in Rizla) like they were no more risqué than chocolate liqueurs.

Mephedrone was incredibly cheap – about a tenner a gram – and incredibly available. You could order it with next-day delivery to your university PO box. Mephedrone was a drugs phenomenon of which I have never seen the likes before or since. Everyone started doing it. I remember visiting a friend at Leeds University during this period. We went to a club and the queue for the men's bogs was at least 70 people long. When I finally got inside the place stunk of mephedrone, you could hear everyone loudly sniffing.

On nights out during this time, everyone would be raging – making out with one another, dancing with total abandon. But the comedowns were immediate and severe, far worse than ecstasy. By 4am people would be lying on the floor sharing the most intimate and personal shames and secrets, as if the drug was somehow compelling them to be honest. Some people called it a truth serum. Friendships were forged in the hot irons of that emotional exposition, as were the most horrendous hangovers.

Mephedrone was banned within two years of it taking off. People talk a lot about one legal high being banned only for another to take its place, but the real legacy of mephedrone was to numb the stigma of harder drugs. By the time I left university, many of the drug abstainers who had tried mephedrone became relaxed about most illegal drugs, too.

Ecstasy and mephedrone make it pretty hard to get much done in the days after taking them. You can't regularly use them and be a successful, functioning adult, so they become a rarer treat once you leave student life. In their 20s most people are overworked: they have second jobs and work incredibly long hours. If they're going to go out on a Friday night they need a pick-me-up. And that is why cocaine remains the young professional's drug of choice.

I see cocaine usage almost every weekend wherever I go: clubs, pubs, people's houses, dinner parties. At fancy celebrity parties, the sort you see on Mail Online, cocaine is so prevalent that it's almost boring. Everyone does it – butter-wouldn't-melt TV presenters, wholesome pop stars adored by your mum, people who would immediately lose their job if anyone found out. Those tabloid stings where they catch someone doing cocaine are kind of hilarious in that respect. If you followed any celebrity around with a secret camera on a Friday night you'd be almost guaranteed to find them doing coke. But cocaine users are like hipsters in the way they will vehemently deny they are one, and cast aspersions on others. "It was just full of self-aggrandising wankers doing coke and talking about themselves," someone will say about a party where they did cocaine and talked about themselves. Most of my friends are cocaine users, but I've never heard them say one nice thing about cocaine.

No doubt some people will have read this piece and think that I am just a monstrous twat, that this has all been little more than infantile boasting in a vain attempt to try to sound cool. But that, too, is part of the cover-up, that any open discussion of using drugs or enjoying them is necessarily a boast. We can talk about great food, great films, great sex, but if we talk about great drugs we immediately sound like we're engaging in some teenage bravado. That's why the biggest taboo surrounding drugs today isn't taking drugs, but saying that they're fun.

I'm not saying that people are lying about the negative effects. I have, of course, seen lives ruined by drugs. Rarely has this been because of an overdose or because someone has ruined themselves financially because of addiction (although I am only 27 – that may yet come). Far more often I have just seen people become dulled through regular drug use: their youthful spark extinguished by a never-ceasing quest to get on it; brains frazzled by overheated synapses. There are friends I want to slap every time I see them doing another line, but I can't because that would be hypocritical.

I also appreciate that's it's easy to be blasé about drug use when you're a well-adjusted middle-class white guy who has never been stopped by the police and has a distant non-social relationship with their drug dealer. For many people, drugs aren't something they can dip in and out of and separate from their lives. People entangled in the economic and legal realities of drugs – dealers, those convicted of possession, addicts – don't have the luxury of my relaxed attitude.

But until we stop pretending that getting high is inherently bad – that drugs can never be brilliant, can never enhance human experience for the better – how can we properly deal with people whose lives have been made worse by drugs? At some point, kids grow up and learn the facts of life. I think it's time we all had the talk.