Uncertainty often makes us hesitant, but when used as motivation, it can produce the most outstanding results. The most successful people I've come across have mental discipline, they harness uncertainty and embrace the possibility of failure. As Mike has shown, a lifetime of success far outweighs temporary discomfort.
Don't compare yourself with others. What you choose to do has nothing to do with others. When we follow what we love, we allow ourselves to be transformed in the struggle of our journey. We become the hero of our story, but we must give ourselves permission to discover our own inner excellence and channel it deeply and freely.