It has long been remarked that courage is not absence of fear, but rather mastery of it. Sounds reasonable. But how to begin the process of mastering fear in general?
One useful way to look at it is in terms of accountability.
Set in your mind the decision to hold yourself genuinely accountable for everything you say, think, feel, and do. Try it, and see if you don’t immediately feel that you’ve discovered a hidden wellspring of courage.