She Can't Feel My Deck During Sex

When we have sex she tells me she doesn't feel anything at all unless I'm going real fast or real slow. I'm 6 " long and 5" girth. Is that small? We took each others virginits so I can't imagine she's really stretched out.. But after a little while around 15 minutes she gets a little dry but still somewhat wet and she starts to burn inside, is thier a reason this is happeng? And also she said she's sore and it stings afterwards...... How does it hurt if she can't feel me I her half the time? It's kinda embarrassing that she can't feel me when I go at a more mellow pace. Is it me? Or her? We've talked about it and we just don't know if we're doing somtbinf wrong. She's also dissapointed it's not like porn. I'm already sensitive about my size so when she says she can't feel it at all really embarrassed me. Is it me or her? And am I small? And any tips?? Any tips on being able to pound her faster and harder so I she can feel more pleasure? All I need is her to feel good