Wanted: Emo Music

Hey! 

I need a song, preferably by a famous emo band/musician, with a line like "you don't know anything/the first thing/a thing about me". And by emo, I also mean bands/musicians that people listen to when they're sad and heartbroken. So, we're talking anything from My Chemical Romance and Switchfoot to Kelly Clarkson and Alanis Morissette. 

Anyone? Anyone? Bueller? You'll get a special thank you when I publish the fic this is for!

ETA Clarification, I want the song to literally say the words "you don't know anything/the first thing/a thing about me" or something similar, not for the song to b about that. Sorry!