You broke up with her on CHRISTMAS? Please tell me you at least didn't break up with her through a text message. That is a dick move. If she did care, then she will forever remember Christmas as the day she got dumped, not to mention that you will remember it as the day you dumped her(and got all mopey over it). Would it really have hurt you to wait a few days and then do the deed? Seriously?
Sounds like you were way too dependent on her and probably clingy. Find some other reasons to live, buddy. I'd never want to be with a guy if I was his only reason to live because it sounds like he has a pretty boring life.