What are you the best in the world at? Regardless of the fact that you aren't the best in the world at anything, and the fact that I don't even know you, I'm still willing to give you the benefit of the doubt and say you are not a failure.
Winning a silver medal at the Olympics is OK. I'm still trying to think of a word that would describe the type of person who would walk up to a Silver Medal winner and tell them that they are a failure. None of the words in my head seem to be strong enough.
Not being the best in the world =/= Failure.