Let me tell you a secret. Many of the people in prominent roles around you are not nearly as confident as they appear to be.
What are we to do when we are nervous and afraid? Whom can we talk to about our doubts and uncertainties? We cannot talk to our competitors, they will come in for the kill. We can't talk to our customers, they will bail on us. We shouldn't tell our problems to the employees, they will lose confidence in us.
Many of the leaders you think have their act together are just faking it. They are swans. They look cool and calm on the outside, but, underneath, they are paddling furiously for survival.
Everyone needs three or four trustworthy friends with whom they can bare their souls, tell everything to. It feels scary at first, but, trust me, you cannot get along without it.