I don't understand

Hey ladies my boyfriend and I found something really weird. Before I was the one that was more aroused and my boyfriend wasn't, but now it's reverse and I don't get how. I would look forward to having sex with him but I wasn't able to enjoy it like I use to and I would feel him pound into my stomach like close to my belly button, it kinda hurts when he goes deep and I would feel dry. I don't understand why I can't enjoy it anymore. I just now feel bad that he had to go through all that and I cant enjoy it. Has anyone gone through this before?