Loss - Is losing a big deal?

Why do we worry when we face loss. either a game or a argument or even business.
Why does loss make you sad. you feel you are beneath the world.. Why Why Why??

little wiser little deeper if we analyze, losing to one's own family members would not hurt much. never you are saddened by a game loss to your brother as you would to your friend at school..

Loss should be a stepping stone and not the end of world. Lot of lives have been lost due to unability to handle loss.

Loss or Victory should be handled the same way as the famous tennis star Chris Evert said..