It's good to want to win, and losing NEVER feels good, but really, what did your wall ever do to you?????? :) Losing isn't the end of the world and it makes ya build character being able to handle the disappointment. You just have to realize that life goes on. The world keeps spinnin. Play 100% everytime you play, and as long as YOU KNOW you gave it everything you had, then that, my friend, is all you can do. Somedays you're the dog, and other days you get bit :)
You can't control your emotions. They happen naturally and involuntarily. But you can control your actions. Don't let your anger and frustration cause you to act impulsively and negatively. Find ways you can vent that anger without negative consequences. Hang a punching bag in your basement and go to town on it when you need to blow off steam.