Most teenagers are glad when they can leave those years behind them, but we'd understand if Taylor Swift, who's turning 20 this Sunday, is reluctant to let them go. After all, during her teens, she's accomplished pretty much everything an artist can accomplish -- except for maybe winning a Grammy. The newly-crowned Billboard Artist of the Year just marked the best year of her career with a sold-out tour, a shelf full of awards and through-the-roof album sales. Still, she tells Billboard that she's not slowing down at all in the New Year. 

Taylor says, "I'm well into writing my next album...I want to continue to write about the things that I'm going through. My biggest hope for the next record is that the feelings I'm feeling right now will be accurately portrayed." Taylor says she likes having two years between albums, so the next record may possibly be out in 2010. Other than that, Taylor adds, "My next goals are to continue on with the Fearless tour [and] I'd love to be able to perform on the Grammys again." 

Taylor tells Billboard her single favorite moment from the past year was every night of her Fearless tour. She says, "Every night...felt like a celebration." As far as the low point, she only says, "I've had a few days...where you feel humiliated or you're shocked by something or something knocks you down a few pegs. But in those moments I've been very quick to realize and remind myself that there are people out there with real problems." 

Taylor has been spending the days leading up to her birthday in New York City, where she enjoyed shopping and having dinner with with pal Emma Stone Wednesday night. She's also been sporting a straight hairstyle that almost makes her look like a different person. Taylor's set to perform at the Jingle Ball concert in Manhattan tonight as well, but she points to another performance in New York City as the moment she'll remember most from her teenage years -- hosting Saturday Night Live. Taylor says, quote, "Honestly, that was the coolest week of my life. I felt like I was part of such a tradition..That was something I'm never, ever going to forget." For now, Taylor's birthday plans for Sunday are under wraps.