haveing pain during the sex

You do notsay, but is masturbation and oral sex still pain free?

Is it possible that he is bumping into your cervix? What happens if he penetrates shallower? Maybe try to close your legs and keep them together to keep him shallower. He can also use a penis ring to keep him from going too deep if that is the problem.

Use a personal lubricant to keep you very wet and slippery.

Spend a lot of time on foreplay to make sure you and your muscles are relaxed.