do i need to pee? or is it a buildup?

hi. so i just recently had sex for the (very) first time with my boyfriend. we’ve had sex a few times after that and it’s been really pleasurable for the both of us, but i’m having trouble cumming. he’s ate me out and fingered me and we’ve tried some other things, but i get really sensitive and it feels like i’m getting really close and then it feels like i’m going to pee myself. it doesn’t hurt, but it’s just kinda like “ohmygosh it’s so much for my head to wrap around”. i don’t know what to do! also, i’ve never experienced an orgasm before. i’m 19 and i’ve tried masturbation and such, but nothing works. sometimes i feel like i’m broken lol

help!