cant cum

so my boyfriend and I have been together for a year now. I've came maybe ONCE. ALL YEAR. our whole damn relationship 😂. I don't mind that much because I still feel satisfied after he has came but I can't find the polite way to tell him he needs to step up his everything game. his head is just barely pleasurable and he can kinda.. sorta finger me properly. the only thing that has brought me close to finishing is when we're having sex, but he finishes before I do :( he says he really wants to make me cum at least once every time we have sex but, i don't think I can. I get stage fright and he just ( sorry to say ) sucks at giving back. I need advice ladies