Right now, it's Fuckin Perfect - Pink. I can really to it, and I'm sure that loads of others can too.
But no song could describe my whole life. Certain songs come in at certain points of my life, but my life on whole doesn't fit any song as far as I know. But you never know, I haven't heard every song in the world.
Probably "What the Hell" sa pamamagitan ng Avril Lavigne It seems the most fitting because my good behavior has decreased this year. To quote a line from the song that fits me the best: "All my life, I've been good, but now...... What the hell?"