Sometimes I feel like horny and want to have sex, so we start foreplay but then realise it's not really wet...

And I know really know why but sometimes it doesn't get wet like my body's not horny...

My bf feels responsible, he thinks I don't want him and I'm not satisfied (takes ages to have orgasm with him while takes 5 min on my own xD)

He doesn't believe me when I say it's kinda normal, I might be physically tired, got my periods (we do it while periods and it's great btw 😂) or smth else.

But not because of him I'm sure.

What else can I say to convince him?