Buzzy British punk-rocker Yungblud was super young — as in barely out of the womb — when he got his first taste of being a musician.

“There’s literally a picture of me with a microphone and a Beatles ukulele across my knee in my car seat on the way home from the hospital,” says the 22-year-old artist, born Dominic Harrison in Doncaster, England. “So I kinda didn’t have a choice [but to be a musician].”

Now he’s a virtual one-man band — he plays guitar, bass, piano and drums — and he’ll be flexing his skills at Webster Hall on Monday. That’s just four days before the Oct. 18 release of his “The Underrated Youth” EP, which follows 2018’s “21st Century Liability,” Yungblud’s debut studio album.

Beyond that Beatles ukulele, music was truly in this bloke’s blood: His dad, Justin Harrison, owned a local guitar shop, while his grandfather, Rick Harrison, played piano and bass, once performing with the British glam-rock band T. Rex. “I was surrounded by music all my life,” says Yungblud, who dated his “11 Minutes” collaborator Halsey earlier this year. “I couldn’t really have been a lawyer or an accountant.” (The fact that his father and grandfather pleaded guilty in 2012 to handling stolen guitars didn’t turn him off to music.)

While inspired by artists such as Arctic Monkeys, Eminem, Marilyn Manson and My Chemical Romance, Yungblud wasn’t a fan of music lessons. “I never really got on with teachers,” he says. “I remember my music teacher in school hated me because she put on Mozart, and I said, ‘I wouldn’t have written it like that.’ ”

Feeling “misunderstood” in Doncaster — “I always wanted to paint my nails or dye my hair or wear a skirt,” he says — he moved to London, where Yungblud was born: “I was like, ‘F–k this, I’m gonna do something that empowers people to feel like they can be themselves and look like whatever they wanna look like and love whoever they wanna love and identify however they wanna identify without f–king judgment.’ ”

That sense of individualism and outspokenness informs tracks such as “Parents,” “Original Me” (with Imagine Dragons’ Dan Reynolds) and “Hope for the Underrated Youth,” where Yungblud is a voice for his generation.

“We ain’t just bratty kids shouting for attention,” he says. “We are genuinely intelligent and informed. And we are gonna be in those shoes and behind those desks one day.”

Clearly, Yungblud is not afraid to get political: “If you don’t say something, you ain’t an artist to me — you’re a f–king karaoke singer.”

Nor is he afraid of talking about having a mental disorder in ADHD (attention-deficit/hyperactivity disorder).

“They tried to put me on pills for it,” says Yungblud, who nods to his condition in his graphic novel, “The Twisted Tales of the Ritalin Club,” out Oct. 29. “But dude, to be completely straight, I love having ADHD. I love being a million miles an hour. I love using it in my art.”

“I’m proud to have a mental illness,” he says. “I’m proud to be who I am.”