Orgasms and not so ooooohhhhrgasms!

My boyfriend turns me on so bad, he has a very decent size penis, but when we have sex I can't seem to have an orgasm no matter how much I play with myself during intercourse. Most of the time I barely feel it until he's so deep he's banging aginst my walls. It's almost as if I become numb during sex. He brags about how tight it is and how amazing it is for him, but unfortunately I can't relate. He makes me wet, then I get dry. Lmao I don't know what to do! We've tried a vibrating ring and even that won't spark a fuse in me. Yet when I'm alone and I think about him, it takes no time to get the orgasms floating. What is wrong with me, seriously?