l'm 25years old & don't enjoy sex

Hello READERS,
          Please I need an advice or suggestions from your readers for a problem I am currently experiencing in my relationship.
          I am a 25yrs old lady in a relationship for about 5years.its a going pretty great I must say except our sexual experiences.
I don't enjoy sex! I never get to orgasm! I can't do doggy! Its hurt like I can feel his D in my stomach! I love him so the only pleasure I get is the fact that I am intimate with someone I love and when I see him climax. We have talked about it, and he is trying to see what works, so far, nothing!
     I am worried, I don't know if this will be an issue for him or me in future, he has said he noticed I don't connect naturally during sex and I on the other hand desire to have a happy sexual life.we do orals and all.
And we don't have sex often because of the distance, so my P is in a good shape. Kindly advice.