Hey Anne,
So I have a feeling this is more about perfection and control, than it is about weight. Most eating disorders stem from the need for control, and the majority of them are not about weight, although it plays a big factor still.
Have you tried talking to a counselor about this, or even a teacher you trust? Talking about it, and finding out the cause of it, can help you get better. Although it's not an easy journey, it is possible, if you want it.
Someone once told me that perfect is an illusion that the mind creates to tell us that we are not good enough, even though we are more than good enough. You are a human being Anne. We all have flaws and faults, but that's what makes us who we are. Imagine how boring the world would be if everyone was perfect, and essentially the same! You can be who you are without being afraid that you are not good enough, because you are good enough. You're more than enough.
If you need anyone to talk to, feel free to
PM me.Hang in there.