What's wrong with me?

Kylie
So, I don't know why, but my boyfriend and I have only been able to have sex 3 times. Each time caused him pain because he could BARELY fit into me. We always try, but my vagina is just too tight! Insertion doesn't hurt me or anything, and we've tried many positions, but it just won't fit. Is there any way to fix this??? What's wrong with me?