Pain during Doggy Style

Hi ladies. I need some help please. I've notice that ever since I've started having sex (7 years ago), doggy style is painful for me. I get pain in my stomach or it just doesn't feel comfortable. There are some times where it's bearable (still not enjoyable) and other times I just bear it because the guy is enjoying it. I try arching my back and sometimes that helps but I would like to be able to fully enjoy it. Is there anyway I can enjoy it and get the pain to stop?