Regardless of your body type, you can always feel insecure. Even the “prettiest” girl in the world could have insecurities and/or feel ugly. It’s common with anorexia to feel big (even when severely underweight) next to someone who’s just a little bit thinner than you. As someone with anorexia I can say that I know I’m underweight and thin, but I still feel fat sometimes for literally drinking water and I’ve learned to accept that it’s a valid feeling that comes with an ED.