Sex without feelings

I have a boyfriend for about a month now (known each other for about 4 months) and we’ve been having sex like once a week, and whenever we do it’s good don’t get me wrong, but I don’t finish, I can’t fully embrace it and enjoy it because I’m not IN love with him. I’m not sure if that makes sense.

Like maybe that’s why I don’t feel a boost of energy after/days after is bc I lowkey feel guilty. I just want to know what I should do or if this is normal? How do I fall in love with him? I don’t want to tell him that I feel sad because of it, if I do then he won’t be happy you know? Like he’ll have that in the back of his mind