How do I get over my boyfriends sexual history?

My boyfriend is five years older, and has had a lot more partners than I have… (As he is the only man I’ve been with) Sometimes, not in a mean way, his past gets brought up. It’s usually my fault because I’ll hint at my curiosity about his past experiences, but when he says it (sometimes rather bluntly) I can’t help but be jealous. We’ve been together for a while, and I still can’t get over it. Tonight some rather intimate things got brought up, and I can’t help but feel inadequate or not special at all, knowing that he’s done everything with someone else (or multiple people) first. Nothing is new or special with me. How do I get over these feelings of jealousy and insecurity?

*If your answer is ”...it’s his past, it’s none of your business…” please don’t bother. While this may be true (Which, it is kind of my business if I decide to bring him into my life) I’ve heard it before and it doesn’t help. I can’t just stop caring-otherwise I wouldn’t have this problem.