She is not enjoying sex. She is probably too inexperienced. Unfortunately, until she is able to orgasm, this is unlikely to improve. She needs to learn how to orgasm on her own before she can truly enjoy anything with you. Encourage solitary masturbation. In the meantime, study up on improving your technique. Oral sex is the most likely way to get a female to orgasm.

Be very gentle in the way you discuss sex with her. She is very likely to find your interest a violation of her privacy.

BTW - you don't build trust by having sex; most females find you need the trust to already be there in order to enjoy the sex. Same for the stress. If you are already stressed out about each other, good sex will be hard to come by.

Honestly though, it sounds like she just isn't ready for sex.

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