Help :(

Daki

Hi, I need help because I don't know what to do with this. I can't cum when my boyfriend and I are having sex but when I masturbate on my own, I can cum. It feels so good when he's inside of me but I just don't know how do I make myself cum cause he's also waiting for me which is kind of embarrassing. It's frustrating cause it might make him think that I don't feel satisfied when we have sex.