I can’t cum during sex

So I’m 18 and am pretty sexually experienced. I’ve always felt like sex was more of a chore than anything else because I’ve never finished while having sex with anybody. It’s still fun and I like doing it but now I’m with somebody I really love and he feels inadequate because I never cum during sex and i tell him it’s not his fault and I never expect it and I’m still enjoying it and I love him very much but I don’t want it to put a strain on our sex life. He makes me feel absolutely amazing and hits all the right buttons but I just can’t get there for some reason? Foreplay is amazing and he does everything so well and we have a great time but again, I just can’t get all the way there. Any advice? I see people on here saying they cum like 3 or 4 times each time they have sex and I’m thinking ??? How? Am I broken??