The primary fear holding most people back is often, “How do I know I’m picking the right thing?” The truth is that this often doesn’t matter, and is actually a hidden fear of rejection. Most people cannot imagine investing so much time and energy into something, only for it to possibly be failure and rejected by society. However this fear is exactly why many people do not succeed at mastering something — they tie their self worth to their results, and let their failures define them. But failure is not final unless you stop trying; failure is not apart from success, but rather is a part of success.
Before beginning any project, consider fully (all of your choices) and then act decisively (pick one). Decide under which circumstances you’ll give up. Then, do not quit until you achieve your desired outcome. There will be times where you’ll feel like your work is meaningless and opinions insignificant, but plowing through this self-doubt is the necessary process of growth and success. Those of us willing to put their soul into the furnace, can forge their spirit into the ultimate weapon. Being good at many things is fun and safe, but mastering something is risky yet necessary for fulfillment.