I have exactly the same problem.
He gets aroused very easily, which arouses me. But when it comes to any kind of stimulation, it just doesn't feel good. I don't feel pain, I just simply feel my own finger/his/his penis inside me, and I derive no pleasure from it.
I feel bad, because he's always keen for sex, but knows that I don't enjoy it.
I try masturbation, but it really doesn't do anything for me.
It's not as though I have no sex drive, because I do, and it's quite high. Is it just that I'm doing it wrong to myself? If that was the case, how come I also feel nothing when he fingers me, or when we have sex?
I REALLY want enjoyable sex.