Success is fleeting, Failure lasts a lifetime. Success has to be reinvented each moment. Failure haunts continuously.
Success and Failure represent the opposite extremes of a pendulum. They go together. You cannot avoid the one if you seek the other. Step back and watch the mechanism at play within your mind. Knowing both, accepting both, and anxiety is transcended.
Life is an experience, not a goal. Give it a try, you may discover the outcome is relaxation.