Struggles with reverse

Brittany 🐾
This is so embarrassing... Me and my SO we're having sex the other day and he wanted reverse so I did but it only lasted like a minute because it was so uncomfortable on my legs and the inside of my vagina like his penis was rubbing against the back of it inside if that makes sense like scraping on the bumps and ridges inside?? Idk how to explain it! But I hated it!!!! Any tips? :/ Also I'm really selfconscious about him seeing my body from that angle. Please help 😔 he keeps asking for it and I say no and I feel like eventually he's going to get sick of me or something