Orgasm Trouble

Hi, I recently started getting fingered by my boyfriend and it feels good, he hits the g-spot and all, it’s just been really frustrating because I can’t orgasm. I feel like I’m close and, TMI, feels the kind of pressure like you need to pee, but I’m having trouble releasing and having an orgasm. It really hurts to be having all the feelings then not orgasming whatsoever. Everything else is painless, just not orgasming is really tiresome and feels like tension inside. Is there something wrong with me, please help :( I really want to orgasm and I don’t know why I can’t