Tips for orgasming?

I’ve never come with a guy. And I relax when we’re doing it and I can’t seem to come. We’ve tried the past three times but I tell him it’s just not gonna happen so he finishes himself and we’re done. I don’t like riding. when I rub my clit and he’s hitting it, it’s like my clit goes numb and it doesn’t feel like anything. We’ve tried several positions but nothing seems to work and I want to have an orgasm with a guy for once. I can do it fine by myself with clitoral simulation. Tips please!