sex confidence? πŸ˜„πŸ˜–πŸ˜’

How do you gain confidence in the bedroom and make it seem like I'm into it? I've lost all self confidence and self esteem when it comes to making love with my SO since I've gained some weight. It's causing major issues since I want to have sex and pleasure him but am just so uncomfortable of myself that I loose all interest. I'm feeling miserable because I've always loved and sex and that connection with him which is trickling into other areas of my life. Anyone have any tips? I really need help...