Been fat all my life and been made fun of for it. I've gotten worse as I've gotten older. People don't understand that them telling you that you're fat or "need to do this or that" to fix it doesn't actually help at all, especially when you struggle with depression. In fact, for many, it can make you worse.

For anyone you have to socialize with regularly, I'd try talking to them about it and hope they understand. They might not, though. Some people just don't have the ability to empathize and prefer to judge. There's unfortunately nothing you can do about that. If they continue, I would only bother with them when absolutely necessary since it's seeming to do more harm than good for you to talk to them atm.