What should I do?

So I recently got with a guy who I've wanted to be with for the longest time, probably around 5 years now. We're both seniors in high school, I'm about to turn 17 and he's 17 now. He was previously in a pretty "serious" (as serious as a high school relationship could be) relationship, him and the girl were definitely sexually active, enough so to leave scars on his back that are still there. It wasn't really any of my business and it still isn't but the scratches bother me. And now that school has started I have people asking me things about him like "so did (my now bf and his ex) "do it?" with hand motions and everything. I also got asked if I got sloppy seconds.

Honestly this just really upsets me. I've never done anything sexual with a guy and I'm now getting asked those really invasive and inappropriate questions and I'm so uncomfortable. He apologized repeatedly, and it isn't his fault but I'm just so uncomfortable and even the thought of doing sexual things with him bother me now. I know it shouldn't matter, and t didn't, but I now have people asking me questions and I'm just not sure how to respond.

I don't know exactly what I'm looking to gain from this, but I'd love anyone's input on it. Thank you.

Edit: so I'm too embarrassed to actually respond on the post, but for clarification the scars are definitely old, no new ones. Also he isn't pressuring me at all. He's actually ridiculously sweet about just about everything, and before school started it was great. It's just the other people that are complicating