Sex still hurts

Okay guys so I was a virgin not long ago and me and my bf had our first time. But then, we did it like 10 times after that and even now, it still hurts when he penetrates me. So, I checked on internet to know what it could be and let me tell you some things:

-I am not pregnant

-I am well lubrificated (we even used a condom that is lubrificated)

-My boyfriend’s penis is not too big

-I don’t have an infection

-I don’t feel nervous before having sex

Any of you had similar problems? What could it be and how can I solve it?

Thanks!

EDIT: I’m also using a very conventional position, missionary