i'd say you're pretty hard into the friends category. i'm gonna throw it out there that you have a 1/3 chance of this going your way (as in she says ok lets date). but that's probably only gonna happen if you put out that you were sexually interested in her before. i.e.: i have lots of friends that are girls and i maintain interest by flirting with all of them, i know if i broke up with my girlfriend at least a few of them would want to date.
if you have just been a pussy all this time she is not going to want to date you. and if you turn on the burners now to try to make up for it she's just going to think you're a weirdo now.
1/3 chance she jumps on board with a relationship
2/3 chance it breaks the friendship you have now.
i would suggest accepting that you let it go on too long completely asexually and keep her as a friend.
http://www.theonion.com/content/opin...urce=c-section
here's a funny article that pretty much sums it up for you. (she might not be this much of a bitch but it's pretty much what the friends category represents)