Your girl friend apparently has severe sexual problem probably stemming from earlier negative experiences. these feelings are so deep inside of her that it is unfortunately beyond you ability to help her. Probably in the past some one forced her to do things against her will and now she cannot get past it. She needs to see a sexual therapist sexual therapist. If you are in the US you can get a referral form http://www.aasect.org/ . I hope that this information has been useful and I wish you both t he best-incidentally if you have health insurance they will probably pay for it..
If you require further clarification or more information, feel free to ask!
Please click the green "ACCEPT" button on this page if you are satisfied with my answer so that I get credit for my work. Your positive feedback is most important and bonuses are always welcomed. If this is a mental health, or medical emergency, please call emergency services (911 in the USA), or go to your nearest Emergency Room. The opinion provided does not replace an evaluation by an appropriate professional. Use of this website DOES NOT CREATE a provider-client relation and this information is for educational purposes only.
I think that she has a big problem sexually. Unfortunately it is not something that she can fix her self. It is like having a broken arm-you can't set it yourself you need to go to the doctor. Well she probably has a history of abuse and need to see a therapist who will help her overcome the abuse so that she will be able to enjoy sex and you too. You ca find a sex therapist at http://www.aasect.org/. Good luck.