How do i help myself with this eating-disorder?

I sometimes wish i was back to the way i used to be. Carefree and i could eat what i wanted. Ive become an expert on everything to do with diet/fitness/calories/fat. I can calculate my calorie intake to the nearest calorie and thats whats on my mind all through maths , english , science. I dont want to get out of bed because the food i ate the night before comes back to haunt me and i cant go out with friends for the fear that someone will make me eat something. I hate my body and spend all day avoiding the mirror. I NEVER eat without checking the calorie intake on EVERYTHING and know the calorie/fat content of every fruit and vegetable per 100g. I have to exercise till i collapse to burn off the calories and cant walk into topshop/h&m cos i cant look myself in their stores full of mirrors. I want ONE day of being free from this and i dont know how to do it. I wont be free until im skinny. Because right now i am fat as ****. I dont know what to do to get help because the people around

If you really want to free yourself from this obsession, then you need to start seeing a therapist to discuss your body image and your relationship with food.

It sounds like its all in your head, Maybe your brain sees that you look fat & it makes your eyes see the same as your brain so all your seeing is fat but in reality your skinny and maybe even underweight.
Please try going to the doctor to talk to him/her and or go to a counceler or phychyitrist (hopefully i spelled that right :) )
You need to talk to a professional about this who can help monitor your weight & what / how often you are eating
good luck
you have something like anorexia. even though you eat you excersize a lot. talk to a therapist or a dietian or something. your not fat. chill out. talk to a therapist.just eat healthy and excersize a little make smart food choices instead of looking at the calories. some stuff like pizza is actually good for you once in a while because even though it has lots of fat 1 your body needs it, and 2 it is high in protien.
It sounds like you severly need to see a doctor, the obessesion with your weight is totally unhealthy. I went to see my doctor becasue I was picking up a tonne of infections and she weighed me and at 5"7 and 19 years old, my BMI was 18 which is far too low. She told me I needed to start eating as I was severly damaging my immune system, my hair was lanky and I was covered in spots from mal-nutrition. My boyfriend was worried as you could see my ribs and I lost my boobs and hips. I finally saw sense and started eating. Im now 10 stone and a size 12 and im so, so happy. My skin has cleared, my boobs are back (yay!) and I feel so much happier. Trust me, men prefer women with something too them. And if you cant enjoy your food now, when will you ever?!
You need to enjoy food and to love yourself, do not worry about what everyone else thinks. I am studying nutrition/ dietetics and a lot of people with eating disorders seem to hate their bodies. Its the only one you have so start appreciating it and get on with your life :)
You need help from a counselor and a doctor. You know that according to the numberes, you are underweight, yet you still see fat. You have lost a realistic perception of yourself and therefore need someone to step in and help you with this. Don't try to do it alone. If you are in school, talk to your school counselor. He/She will be able to get you connected with a professional who can help you. If you're an adult, talk to your doctor or counselor if you have one. Over the long term, you will need their support in changing your perception of yourself to a more realistic one. You will also need education from a nutritionist about what is a healthy caloric intake as well as proper nutrition.
i dont think that you can do this alone, you need support from family or friends or a doctor, you have to realize that you are making yourself more unhappy by being so obssessed with food, if you dont eat enough your body starts taking the nutrients out of other places on your body, so that your body starts lacking essential vitamins etc, this will cause problems later in life. i know about this because i went through anorexia when i was 13 and now nearly 25years later i am suffering the affects on my body of the harm idid to myself through being obsessed with losing weight. i still get obsessed and yo yo diet, which in it self is just as bad, dont diet for everyone else do it for you but do it healthily and slowly, we are so destroying ourselves because we have to look like others want us too look, and we are the ones that are going through life unhappy, yes we all know it is not healty to be too fat or too thin, but it is also nut healty to be under this amount of pressure and stress every day. please talk to someone, if you have no one then find a slimming class that will help and not let you become to obsessional with it.