How much of failure is determined by mindset?

I had a dream last night I had a huge nasty sugary orange Icee sorta drink. It was awful. I didn't want it but there it was in front of me. and then I was looking down at a huge pizza and I planned to eat the whole thing. I had resolved. I only ate one piece before i woke up. I think I'm just nervous about staff lunch today and not wanting to stand out and not wanting peer pressure to eat junk either. And last night I took Ray to Grooveberries and had a few spoonfuls of her melted sugar mess that she couldn't eat.