It's natural to be annoyed with yourself for losing something you have influence in. You've got no effect on the outcome of any game united play. To be annoyed for a 'few days' is way over the top if you ask me.Winning or losing at golf and United winning or losing affects my mood for a few days. That doesn’t mean I “take it out on people”.
If you can simply accept defeat nor enjoy winning then life is a bit bland.