Is my (26F) boyfriend (36M) not attracted to me enough because he sometimes can’t finish and isn’t in the mood every day?

We have been dating only for around 4 months now and this is supposed to be the honeymoon stage and we should be all over each other all the time but he has said that he just doesn’t have much interest in sex and sometimes even when he does he can’t finish once we are at it.

It is really eating at me. I am 10 years younger, I think I look fit and I try to be “an active participant” but could it be that he is just not that into me/attracted to me physically? When I asjed him, he said no, but of course he would say no.

How should I approach this?

Tl;DR Libido problems in a 10 year age gap relationship.