My girlfriend's vagina hurts in some areas when i touch it?

My girlfriend and I have been messing about in the bedroom quite a few times, and she pleasures me. When i try to do the same to her though, it hurts her. I notice that it's mainly the clitoris and the actual vaginal opening. When I touch that pink ball thing under that hood of skin. She says that it hurts but feels good at the same time. She is still a virgin and we have not had sex yet. I have also not fingered her, only touched her. It makes me feel inadequate as I cannot return the good feeling she gives me, and I want her to feel good, and not cheap. Please help, what can I do to get rid of this pain so that it makes it more enjoyable for her too.