Sex issues?

Morgan
This is very personal, and I've been debating whether to post this publically or not. But mainly, sex is painful when my partner and I do doggy style. Now, its not every single time- sometimes it feels really good!!! But other times I can almost feel him up just below my belly button. Now I don't know if that's because he's too big and he hit the top or if its just the angle we are at. We try to find the right position, but we are usually unsuccessful and have to resort to different positions. I really love doggy style. Does this happen to anyone else? How can my partner and I fix it?