Can't orgasm during sex?

Chloe

So, I can make myself orgasm whilst masturbating pretty easily, just by stimulating the clit. But I can't seem to orgasm AT ALL during sex, or even when my partner gives me oral, and I feel so close to but I am unable to push it. Is this normal? What else could I try to make myself orgasm? It makes him feel guilty every time he finishes as he's been unable to make me finish too 😔