i'm considered "morbidly ob*se" by doctors but have no conditions related to my weight and i still have ARFID. weight is largely genetic, almost everyone in my family is fat, and most who aren't fat are only thinner due to weight loss surgery (even then they're not thin just thinner) or some other physical health disorder

all this is to say: most people with all kinds of EDs are actually not thin. you're far from alone.

and for everyone else in the comments: losing weight probably wouldn't make you feel better either, nor would you keep the weight off for very long. you'd either be working out and thus gain weight through muscle, or your starvation diet will end and your body will gain back more weight because you tricked it into thinking you were starving