A loser can be defined simply as the person who doesn’t have the courage to be who they want to be. The loser is held back by fears — fear of what others will say or think, fear of failure, fear of discomfort, fear of leaving their loser friends behind.
There are other fears, but those are the main culprits.
So who is a loser?
Since only you know what you want to be, only you can answer for it. And only you hava to live with it.