for one, climaxing is not nessecarily THE most enjoyable part of having sex, IMHO. That being said, it should ofcourse be an option
so what's going on, are you both stressed about it? does she feel bad about not being able to cum?
If even she cannot bring herself to orgasm, don't expect to be doing much better. I've never heard of someone being able to climax by someone else but not on his or her own.