I'm the kind of person," Taylor Swift explains, "who needs to feel like everything happens for a reason. When you date a guy and it goes badly, that's horrible. But if you can write a song about it, then it was worth it." By that standard, the petit tragedies of Taylor's teenage years are looking pretty close to priceless: Her self-titled 2006 debut, which took as its subject matter the artist's life as a young girl, sold more than 3 million copies. And Fearless, her double-platinum follow-up (which features at least one song written about her most famous ex, Joe Jonas) debuted atop the Billboard 200. "I never expected all this would happen to me," the nineteen-year-old says. But in the midst of the madness—she's been planning her first big U.S. headlining tour, which starts in April—Taylor shut off her cell phone (current ring tone: Carly Simon's "You're So Vain") and spent a couple of hours talking to Teen Vogue.