For as long as I can remember as in from being a child, I have been a secret binger, have found satisfaction from refusing food or eating little while in the presence of others and also have hated my body
If I were you I'd really want to understand why that is! Seriously, I'd enter into some form of counselling to explore it, if possible. It's very interesting that you remember always being that way. 
My reason sounds rather dramatic--I was sexually molested at about 12 or 13 years old and ate my way into surrounding myself in a layer of fat to protect me and make me "unattractive" to Men so it wouldn't happen again.
Years later I'm still dealing with the fallout from that, but I know my initial reason, and that helps a lot because it doesn't really have any power over me anymore.
I don't think there's necessarily one big thing for everyone. It can be a combination of so many factors. But I definitely do recommend exploring it.
Healthy body, healthy mind, etc... 