Does anyone else feel this way? How can I cope?

I have major insecurities with myself especially sexually. I had 2 babies, and I feel like I’m way too skinny to be in any positions like doggy style etc. I also don’t like having sex unless it’s dark because I don’t really want him to see down there.. I feel like having babies really just messes up your self esteem. He says it’s nothing he hasn’t seen when I gave birth & that there’s nothing wrong with me

but I do feel like that’s different than being exposed in a sexual way

I do want to be more comfortable but I just don’t know how.