Why cant I cum !?!

baldi
Ok so me and my boyfriend have really great sex but ....... I never cum?!? Like he doesn't cum early at all but its like it feels really good but I don't know if im cuming. I just get tense. I masturbate and can cum that way but its like when we have intercorse nothing happens!! Dont get me wrong it feels so good when we're doing it but thats it!
🙄🙄 Anyone go through this?