Sex advices

So, I've never actually gotten off with my partner before.

Both him and me have tried, and after the first few minutes of sex, I don't feel that much vaginally...

I've tried vibrators and rubbing and grinding for my clit (started with him using them on me, then I just started to use them on myself during sex), and still nothing. Hell, I even tried doing exactly what I do when I masturbate.

My poor boyfriend tries for hours (literally), and I still can't finish or anything.

I'm beginning to think I'm just one of those people who can't get off with another person....

Is this normal, or am i mentally cockblocking myself?

Any advice/people like me out there? I feel kind of alone and frustrated in this....