Is this normal?

Hi. I’m 15. I’ve been in a relationship with my boyfriend for 2 and a half years. We have had sex before. When I was a child, I was molested. I didn’t think it would ever affect me, but I think it might be now. I’m not super into PDA while my boyfriend is. My boyfriend is always horny... while I’m not and there are A LOT of times when I don’t want sex. I tell him it’s because we are young and don’t need to always do it, but I think that’s just an excuse for myself. I think as I grow older, I still won’t want it. It’s not just sex, he can be grabbing or touching my butt or trying to grab me in places and I’ll just be super annoyed because I don’t want it. I feel bad because there’s a couple at our school who is the same age and they’re always doing that stuff and posting about it... and it just makes me upset I guess because I don’t give that stuff to my boyfriend. Am I in the wrong? Have you felt this way, how did you deal with it? Please like I don’t know what is wrong with me.