When I was a teenager I used to purge everything I ate
Did you really? Why would you purge everything you ate?
So I could stay as thin as I could.
If you have difficulty eating in a normal, unhealthy way, you should seek medical help. It is not good for your body to throw up so much, and your body needs calories to survive. You should keep from doing things like purging that will be bad for your long term health.
Yeah, I know. I'm still purging but not like when I was teen. I just want to stay as superhot as I can.
I believe you need to seek help right away because this sin't healthy in the long term. Is a good body really worth the pain and anguish your body goes through? How about trying to eat normally little by little, to get your nourishment back up?