Orgasams: How do I know? What am I doing wrong?

I've never physically came.
I get to the point to where I can barely handle the pleasure, but then I cant continue on my own, and when my partner does it, the feeling just stops after so much.
I feel like i'm doing something wrong, because it's not all that great, even with my partner.
And he's hitting all the correct spots. 🙄