A hitter in baseball can fail 70% of the time and still be an all star. I coach minor baseball (little league) and spend a fair amount of time reminding my players of this fact. They want to get a hit so bad, for Mom, Dad, Grandma, Grandpa, that I quite often see them coming back to the dugout in tears if they don't succeed at the plate.
Sounds alot like traders. You can have a very successful plan with a winning percentage under 50% with proper money management. Yet how many of us (me being part of us) come back to the dugout after a losing trade looking like we just lost our best friend.
As I tell the 10 yr old baseball players, the key is not to focus on what just happened, the key is are you ready for your next at bat.
Solfest after a losing trade
Today, a couple of homeruns.