pain while having sex. common or?

Hey guys. This is an embarrassing thing to talk about but I need help. I'm a 20 year old female and me and my boyfriend been together for 3 years now. I lost my virginity to him 2 years ago. The first time we had sex hurt, obviously bc I was a virgin. Now every time we have sex it still hurts really bad. I don't know if there's something wrong with me or not. Any suggestions about this?