If you determine the value of who you are or what you do by the results of your effort, you doom yourself to the fear of failure.
If there is one thing life has taught me, it is that results are unpredictable. Results have everything to do with circumstances, context, and timing - things beyond our control. I have seen people do virtually everything right and get a negative result. Conversely, I have seen people do almost everything wrong and get a positive result. Go figure.
Rather than worrying about results, we should focus on process. If you do your best and your effort is an expression of your true self, you are a success regardless of the outcome. We should be rewarded "in" our actions, not only "by" them.