I have seen some women report that if they get TOO wet, they stop feeling friction and really are not feeling much. But this does not seem to be the case with your GF. I've had some girlfriends that said they get too wet and cannot feel much. I've had others who were super wet but loved it. The second group of girls I think were more open-minded and relaxed about sex. Which shows you that mental stimulation is important for women. So, dirty talk from you might be in order to help her get off.
Other than that, I agree with the other advice the others gave here. She doesn't have to orgasm to really like sex, women are not like men. Men have to orgasm because their hormones are very high, and if they don't orgasm, they get very very frustrated. It's a really big deal for men. Not a big deal for women. If she wants to orgasm, she needs to use her own fingers to stimulate herself during intercourse, instead of making you do all the work.
I think her selfishness is a lack of maturity, and I think you will eventually get tired of her immaturity. However, just enjoy things in the mean time.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
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