stomach pains every time we have sex?

I am 20 years old and have been sexual active since I was 18 with only one partner and for the last year anytime me and my partner have sex I experience for sharp pains in my stomach, mostly my upper stomach. It feels like I am beings stabbed. The pain doesn't seem to be linked to the positions, it happens in every position at some point. Also he may go in the same speed, same angle, and all the way in several times and it may only hurt once. I experience the stomach pains every time we have sex. The pain has done nothing but progress over the year, it has been so bad that I've started crying uncontrobably. This problem has made it where me and my partner have become less sexually active. I have been to the gyno and mentioned it and was told nothing was wrong with me physically that she could see and that most women experience it and I would grow out it but haven't. I dont think my pain is related to my partners size being that He is the only one I've been with and I have been with.