ditto what everyone else said.
You have to get to know your body and not try to be like other people. If everyone looked the same, what a boring place we would live in.
For example, I know that I can eat whatever I want in moderation. I know when it is time to go to the gym and I don't obsess over missed days or weeks because I know I can catch up later when I feel up to it.
It takes time to get comfortable with yourself, but you'll get there. And remember, we are much more critical of ourselves then anyone else is. We see things that no one else would notice.
Get over yourself...and I mean that in a non-mean way.