What defines a professional loser? Someone who
You've seen people like this; they see someone get promoted, hit a sales target, win an award, and all they seem to get out of it is rage and resentment towards the achievement. Rather than look at their own shortcomings, need to improve, or appreciate the achievement of another, they take the short road and belittle the achievement or the person.
If you don't win an award, get the promotion, or get a job and someone else you know does, look at it as an opportunity to reset your clock, your goals, and your desires. Make it an opportunity to look inside and see what you need to do next, and why in fact you didn't get what you felt you deserved.