People are too dramatic. My advice: don’t get too high when good things happen, and don’t get too low when bad things do. Not everyone who does a favor for you is a best friend, and not everyone who disagrees with your choices is an enemy.
Your life is not set after one victory, and it’s not over after one defeat. Do not live in fantasy land, or the bottom of a black hole. Not saying you can’t be emotional, just stay stable.