The answer is simple,

$300 is NOTHING for a real gamer, you need to spend at least $1000, if you don't have the money rob a bank (it's totally worth it, you can even get an orgasm because of all the adrenaline going through your body) second, don't wear only a t-shirt, wear pants, socks, jackets and even more, but not only from angry birds, also from other games (Farmville, Barbie's race and ride, Cityville etc), otherwise they'll think you only play angry birds and you don't want them to think that!

Finally, post your facebook wall full with farmville etc. they'll take you serious then, also be sure to send your friend alot of invites, at least 3 a day.

I hope this will help you.