Feeling like a fraud

People see my as super healthy – I have a smoothie in the morning – a healthy snack – salad with chicken at lunch – I don’t indulge at work….yet I got off work today and got fries, pizza, and ice-cream…i feel fat and disgusting; shame and guilt…and I try to figure out why i keep doing this – I was playing with the idea that I wanted to be an example of health…but then maybe I get thoughts of “oh that could never be you” feel like thats too much pressure to put on myself…and self-sabotage?