i (26f) feel miserable in my relationship with him (27m) idk what to do?

we just got married and he was against sex before marriage which i was very patient with and understanding. the first three months of marriage we’d have sex and yes he’d finish quickly but i was ok with it because he was a virgin. the sex was okay, but lately he doesn’t even get hard he gets soft quickly he says he gets nervous and because it keeps happening he keeps thinking about it. i feel miserable, sex is so important to me and i feel weird about that because im the female and it’s like i have to beg him to have sex with me. idk what to do, i can’t be soo happy with him without sex. other than that i love him and i do want to stay with him