Well at least she was throwing you a compliment. Her Not knowing your situation is unfortunate but don't let it get you down. Live life to its fullest OP. :)

I'm sorry OP, that must've hurt to be reminded of it even though the woman meant well. I know how it is to be told that you're too skinny, it's just as damaging as being called fat. You must look pretty good to be called out for it though! :)

The **** is OP?

aye, own in, some people would love to be skinny without trying. (I have one too)

Try wearing a T-shirt that says it so people don't accidentally compliment you on something that's the result of a disease invisible to the naked eye.