Co-workers think I am fearless. But that is not entirely accurate. Often my passion do do the right thing overrides any fear. As czar said so well, fear (like fear of public speaking) can be turned around and be used as an energizer.
Also, I bared my soul to God, so it is difficult to humiliate me. I readily admit to my weakness. Weakness is rarely admitted to in the "world", I mean, doesn't that leave me exposed to the sharks? In practice, however, my readiness to admit my faults has baffled and terrified my "sharks". I come off as supremely confident. Weird, huh?
I figure it is this same kind of "strength in weakness" that Jesus championed. He spoke boldly. He wore no armour. He allowed himself to be stripped. Yet, he completely intimidated his enemies and ultimately triumphed over them. I admire Ghandi and Martin Luther King for those same qualities.
I think a natural example would be some of the martial arts where the defendant bends under an assault. What appears to be a weakness turns in to a strength, as the assailant finds himself overextended and unbalanced.
Fear, in the right context, is useful. Like fear of heights, fear of guns. I think fear of dying kept my Great Uncle Christie alive through WW 1. But these are short-term fears to a direct threat.
As others have expressed so well, it is social fears and chronic, ill-defined fears that cripple us.