Alright I am 17 years old and I have been abnormally skinny for my entire life. My arms are sticks and my waist is nothing. No matter what I do I cannot gain weight.

I have always been a hefty eater. I eat more in a day than just about anyone I know. No matter how much I eat however, my body decides to expose of it within about half an hour. When I was born I was almost 11 pounds which is aparently very unheathy. I have been tested for diabetes and the test was negetive. If I go one day without eating allot I can literally lose (and I have weighed myself) over 7 pounds in a day. My mother always just said I have a high metabolism but thi is abnormal. I do not know another male within my 6 year age range that is as skinny as I am, and the ones I do know are heroin addicts. Any insight would mean the world to me.