Boyfriends injuries

So my bf was hurt two years ago in Afghanistan, he is now a double amputee. It doesn't bother me that he is but he has become so self conscious about how he looks. He refuses to wear shorts with his prosthetics and will not go in public anymore without his legs on. I'm so happy he's alive and tell him I love him everyday but I feel like I'm failing as a support system because he has become so self conscious. I try to encourage him to try it atleast once without pushing but he won't. Tips or advice on how to help him? Or be a better support system?