Are you crazy? You are obviously not smart for your age. Anorexia can cause some severe damage on your body. If you don't give your body the nutrients it needs long time effects will come.Then you'll just look really nasty and skinny, and that is not attractive for anyone. So if thats what your going for, to look good, you're just making yourself look worse. Try a diet or exercising don't put your body through that!! Even if the diet don't work it will when combined with good hard working exercise.
Anorexia is an eating disorder and is very hard on you body. While you are young now and it might not seem important, anorexia will cause issues as you get older, such as trouble with your periods, difficulty/inability to have children, as well as others. I've been there, done that, because, as a teenager/young adult, the only thing that mattered was that I have a great body; I began suffering the consequences when I was in my late 20's; I continue to suffer consequences today and they will stay with me for the rest of my life.
Here's something to consider: once you stop eating, your body thinks it's going to starve to death - it will if you don't feed it - so it struggles to hold onto fat stores, in order to protect itself from starvation.
I don't what kind of "diet" you went on; implementing a healthy diet, with adequate exercise is the best/safest way to lose weight and keep it off. If you don't properly nourish your body, it will won't hold up for a lifetime.
If you stick with lots of fresh fruits and veggies, low/no fat dairy, lean protein, etc, and get plenty of exercise, you should be able to lose weight and keep it off.