Orgasm Trouble!

I've 26 and I've never been able to orgasm during sex but with my new partner I feel like I'm getting really close then it just stops! I get weak pulsations like I would with a clitoral orgasm but I don't feel anything :(
Also when I try and stimulate my clitoris while have sex I can't feel anything up that end either!
When solo i can feel the tiniest movement on my clitoris and it takes me about 1 minute to reach orgasm but it's like it stops working when someone else is around 😭
He's super chilled and nice and spends so much time on me trying to help me reach orgasm but after about 45 I get fed up and give up.
Any advice please? Has anyone been in this situation too?