Sex me not

Penetration doesn’t pleasure me at all, I’ve tried in different positions and they all feel the same. I only really enjoy oral sex and other sensual things with my so. Whenever he asks me how was the sex I shrug it off. I don’t know what to say without making him feel like it’s something he’s lacking because I feel like I’m making him a little insecure, when it really isn’t him. Any advice ?