When life offers you a challenge, don't let fear cause you to stay away from it.
Can you imagine Joan of Arc whimpering, "What? Lead an army? I can't even ride a horse."
Can you imagine Christopher Columbus saying, "How can I be right and all these other people be wrong. I'm a fool to think I know better than they do. What if I fall off the edge of the world or we get eaten by sea monsters?"
Suppose Thomas Jefferson had caved into his fears and said, "What makes me think I should write a Declaration of Independence from England. They are a great country. They will crush us and I will lose my property, my house and my life."
You say, "Yes, but these were great people." Right! But they weren't great people before they took up the challenge.