Perhaps we ALL want look like boys because my aim too is to look boyishly slim with no hips. The problem is that it usually doesn't end that way because I swing from a lowish weight from starvation to a relatively much higher weight from binging.

However I've never been at such a low weight as you marcel and whatever your height, that is a very low weight at 30kg. The binging is happening because your body is desperate for calories after being deprived for so long. The problem is that (for me anyway) the binging is hard to break and for me has a annoying, frustrating and depressing tendency to go on for far too long (months). But I am not an anorexic so maybe things might be different for you.

So I suppose after all this I'm just saying I don't know what to say re: the overeating thing. The only thing I could suggest would probably be deleted. But seriously at 30kg and even at a small height, maintaining that weight could kill you.