pain during sex ?

I've only had two sex partners, I've been with my man for 4 years & I always seem to have pain during sexual intercourse. I've gotten tested & i don't have any kind of infection or anything. I'm clean & perfect fine .... but I'm wondering why I always have pain during sex, is it because he's too big ? Is there anyway I can stop this from happening I really want to enjoy having sex & not having to say ouch your hurting me 😩😩