sex & cumming

my boyfriend can't make me cum neither from oral or from actual intercourse. it doesn't bother me much but I noticed that when I do play with myself while we're fucking i don't really have a feeling.. lol like I masturbate about once a week and it feels like heaven but when I do it when we fuck it literally feels numb.. like I said it doesn't really bother me.. just trying to find out why? I wanna make myself cum and he wants me to cum but if I have no sensation while he's fucking me then I can't do it.. frustrating 😭😂