Make a list of things that you want to do before you die.
After you are done writing the last item on the list, revist each item and put a reason for not doing it yet.
Take a closer look. Is fear (in one way or the other) a factor that stands out as a hurdle?
Your calling is clear, and I agree, so is your fear.
Side Note: What we choose over what will define us and our contentment.