How to cum/orgasm?

I need some help 😭 me and my partner have been having sex for a while his my only sexual partner I’ve ever had but I’ve never been able to cum or orgasm as it seems 🤔 or I have and I don’t know what’s happening

Anyone have any tips or what to do?

I always feel as though I need to pee but I’m too scared to let it out so I have to rush to the toilet