Can’t Orgasm

I used to watch a bunch of porn and masturbate and i could orgasm then, even if they were small i could. But now even by myself i can only build up to it. Also, I can’t cum when me and my boyfriend have sex

:( my clit always gets too sensitive and i just can’t (I’ll only do it for a couple of minutes while we are having sex). But I can’t cum

:( and I’ve been so close but it wont happen! What do i do? Can you help?