Nothing Gets Crossed Out by Bright Eyes would have to be my theme song:
YouTube - How to Play Nothing Gets Crossed Out by Bright Eyes

Lyrics can be found here:
SongMeanings | lyrics | Bright Eyes - Nothing Gets Crossed Out

I think the lyrics are pretty obvious in this song.


Can I have more than one theme song? If so, this one can describe me pretty well, too, sometimes:

Contrast and Compare by Bright Eyes (It's not the best audio in the world, but it has more of the song than any other site does. I can't find the full track):
Bright Eyes Letting Off The Happiness CD

Lyrics can be found here:
SongMeanings | lyrics | Bright Eyes - Contrast and Compare

Lyrics are pretty obvious, too, in this song.