i can’t cum

me and my boyfriend have had sex a lot times lol i’ve lost count. but i’ve never been able to cum. i lost my virginity about 3 months ago so i don’t know if that has anything to do with it. when i masterbate by clit rubbing sometimes i can cum and i’ve been really close but haven’t been able to come when fingering myself. i’ve been masterbating for years and i used to get really turned on by porn but lately i haven’t been able to.