Help!

Okay, ladies I need some help or some thoughts. I don't per say have a boyfriend, but this guy and I have been talking for a while and we have had sex. The problem is I want to have sex before the fact, but then once we actually get in the moment, that all goes away. It still hurts to have sex and has ever since I lost my virginity. I don't know what to do, or how to make it better. I just want to make sure I am pleasing him.