Of course, it hurts when you lose! Big time!! Especially when you and many others know that you were actually the best.
But then what choice do you have? Either you can cry foul play or you can let it go. Whichever you choose is completely your choice. As long as it is justified, you are right to do so.
But always keep one thing in mind. Most importantly, BELIEVE in yourself. Believe in your talent. Believe that you did good.
The world will say all sorts of things to bog you down. That is what it does. You do what you know. You believe. The world will have to come around sooner or later.