I would say explore your options
You seem to recognize that she is bad for you. You even said you believed she was your drug. If that's the case, you should approach it as such.
I think talking to someone is a good choice. I think like all addicts you need to seperate yourself from contact with her.
If I was in your shoes, I would continue to enjoy your youth but through other people. Like you said, you lost your virginity to this girl, so its understandable that you have a certain level of emotion attachment; however, you need to realize that your emotional experience is limited. You have to realize that while you may (dis)like someone, they aren't the right person for you. Easier said than done, but move on and find somebody new and clean out the demons in your own closet.
Try to find a more sane girl next time