Every week, teenagers around the country tune in to Gossip Girl to see Taylor Momsen play Jenny Humphrey – a high school rebel with requisite teen angst. But just to be clear: Momsen says she's hardly a typical 16-year-old in real life.

"I live a very adult life," the high school graduate (she got her diploma two years early!) tells Teen Vogue in the September issue, hitting stands August 4. "What am I going to do, hang out with high school kids? I just can't relate to what they talk about – it seems so petty."

And that includes high school boys. Momsen, who claims to have been in "lots...