How to get confidence so I will begin to eat again?

I have always felt really fat so when I was 12 I began to stop eating like totally the only thing I eat was like a VERY small meal for dinner that I throw up later but I actually was happy because I finally begin to be happy but everytime I meet somebody new ( I'm 16 now) always aks why im so skinny and why I don't eat and I can also begin to see how disgusting it looks that I'm so skinny but I still feel VERY fat so how do I gain confidence so I can begin to eat again like a normal person?
How to get confidence so I will begin to eat again?
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