He always asks me why I never want anything done to me and I always tell him because I don't feel comfortable with it and I don't. I dislike anything that happens with sex but I do please him every so often just to make him happy but he hasn't noticed at all that I never bring up anything with sex to him he always starts it and I just go along with it up until a certain point.

I was talking to a close friend of mine today and I told her about it and she was perfectly okay if it and understood so I figured I'd tell my bf too but I couldn't and now I'm scared to.

 How did you guys tell your SO if you have and how do you deal with it? 

*edit: I didn't know what asexual was when I started dating him I just thought I hadn't  found the right person to make me feel like I wanted sex. I see that that wasn't the case.