You guys are pretty weird at trading since you are hinting the amount of money on the line changes things. I don't care about money, to be honest. I even donated $8k of my scholarship money while in college, leaving me only $2k. I did it, because it was all I needed.
Now, with all that said, I will sometimes feel bad after many bad trades or even a single bad trade. Or during a downturn in my equity curve. It's because I'm wrong, and my pride is hurt. It has nothing to do with the money. This is just a game or tournament to see who is better, % returns (and other statistics) are the measurement of success in it. I want to be right and succeed.
I was reading some guy talking about $/pip ratio or something, that is what sparked all of this. When I trade, I only look at the pips. It is the most incontrovertible measure, making for consistent thinking. All you need is it and your current leverage.