What is it that you want from her?
Is it her friendship? Is it her love? Is it just sex?
You sound like your whole well being depends on a single girl, and honestly, that's bullshit, you need to stop hanging out at the chat rooms, go to a mall or wherever, and find some girl that you like enough to talk to, if you want a friend, just go to some pizza parlor, find the ugly fat chicks and talk to them, believe me, they'll be nice to you in no time, and they'll actually call you.
Just find someone with less self esteem than yourself, and it will help you get on with whatever you're doing