Weird question

Okay so this is going to sound very weird and very personal but I’m struggling with it a lot. I’ve noticed for a while since I had my daughter 2 years ago that my anal hole was almost like caved in and stretched out if that makes sense and darker around it. I’m so self conscious of it and it makes me feel like my bf thinks it gross when we’re in doggy. If someone could help me understand or tell me I’m not alone that would be great