What does it matter if it is statistically "normal"? Your girl likes it, and you don't. I think you need to BOTH be willing to compromise, which means NEITHER of you will get 100% what you want. That is what a good relationship is all about - neither of you getting exactly what you want. (Okay, that part is a joke.) Good relationships are about compromise.
That being said, I think many women prefer face-to-face as it is more intimate and allows you to connect better to your partner. (This is not to say that we don't enjoy it from behind.) I wonder, though, if this is a symptom of another problem. Are you having any problems with intimacy in other areas of your relationship?
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?