That's okay sweetie. It's very hard to see other people suffering with the same ailments that I've had myself, especially this awful one.
And if you only ate tomatos and lettuce for the rest of your life not only would it be very boring. But you'd probably die within 6 months?
You need vital food groups in order for you to survive. For example calcium (for bones and teeth), carbs (for energy) protein (for strength) things like that in order to stay alive.
And believe me, even if you were still alive. It wouldn't be worth it, your mind would be consumed with eating/not eating. Counting calories.
It's a terrible thing, don't go down the starvation or throwing up route. (Besides, throwing up doesn' t even work!)
The worst time of my life was when I suffered from anorexia, not when I was being bullied, or when my friends looked better than me.
My life was consumed by food, I wrote pages and pages about how I was starving myself and that I must get thin. I went down to a size 6. And even then, I wasn't happy. I looked ill constantly. I couldn't go to college. I could bearly even walk. I used to lie in bed, crying, thinking that I was dying.
And I'm still not even well now, I suffer badly from depression, I bearly go to work, I bearly ever go out, or have a life.
My suggestion is that you don't need to change your body, as long as you are healthy and confident, that is the be all and end all of it.
See a doctor, or a teacher. Tell them how your feeling and see if you can see a counsellor. A counsellor will teach you ways to build on your confidence, then your size won't ever be a problem.
Losing weight doesn't mean you'll be happy.
Remember that if nothing else.