Sex Addiction?

Abbie
I think I'm addicted to sex and I'm not sure how to deal with it. I want it 24/7 but usually I'm not even in the "mood"? I want sex so I can please the other person, usually not for myself. Also the more pain during the better. I like getting to the point of almost passing out while I'm being choked and being slapped across the face so hard it leaves a mark. I'm scared that eventually I'll get hurt on accident. I get too risky with having sex in public places and I know eventually I'm gonna get I'm trouble but I literally can't help myself. I'm always initiating it, and I'm scared its gonna affect my relationships, especially since I've hooked up with multiple people during the same time period and they didn't know about it. But I can't stop. I bring it up constantly. What should I do? Do I really need to attend some kind of support group? Please don't send any kind of negative comments, I'm really only looking for support.