How To Get Over This?

I was molested when I was younger, but its never really had an impact on me after I told someone until now. I have my first serious relationship with a guy that I'm fully comfortable with, and we go very far quite a bit and I'm fine with it until it comes to touching him...I feel really bad because I'm letting this affect me and the realtionship but I know its not my fault and want to get past this but I need advice on how to not have a panic attack everytime he wants something or even when he just cuddles me from behind. Any advice? It will be greatly appreciated