Boyfriend insecure of his feet

My boyfriend has a lot of insecurity about his feet. He was in dance from age 2 and just retired 2 years ago and he's 25. He did ballet, jazz, contemporary, Hip-hop the whole shabang. His mom was his dance teacher and was basically Abby Miller(if you've seen dance mom's). She was really hard on him being perfect. She made him go competitive. And ballerina's already usually get bad feet because of the shoes. And he was practicing 12-15 hours a day. He has no joy in dancing anymore which is why he completely quit. His mom hasn't spoken to him since he quit. He usually wears socks because he's so insecure about his feet and toys. He literally wears socks with sandals. He doesn't swim or do anything that involves people seeing his feet. Just wondering how I can help with his insecurity.

Edit: They are just very crooked and callused. He has "ballerina" or "dancer" feet. I could try the private pedicure but he's so embarrassed of being judged.

Edit: So what you guys are saying is it might not be just that he thinks his feet are ugly, but that they remind him of his traumatic dance career?