Losing Mindset vs Winning Mindset

This is a game I lost because I taught I made a blunder but it wasn't actually a blunder. The reason I taught that I made a blunder was because of the fact that I was playing a much higher rated player than me. I was under the impression that he might make better moves than me in fact we both made correct logical moves. 
I will be playing another game by keeping a "Winning Mindset" and I will post it in the comments.

For now here's the game, its a Nimzo-Indian