I feel you. And if you always end up ordering a salad your friends are going to say something annoying or it will just frustrate you seeing them eat that unhealthy staff while you are 'forced' to eat that.

I just think you have to eat that 'bad food' sometimes until you will feel normal. Its all in your head. Just say to yourself that you deserve that whole dessert because you are perfect the way you are until you really feel better.
Its a journey but if you try more often, maybe you will get used to it