When Jesus came to the disciples walking on water, Peter said, "Lord, if it is You, command me to come to You on the water." Jesus told him, "Come." Peter was about to do something he had never done before. He got out of the boat and walked on water (Matt. 14:28-29).
Why did Peter ask Him to say, "Come"? Because to do something that scary, he had to hear a word from God. When Peter heard Jesus say "come" it produced faith in his heart (Rom. 10:17) and he knew it was God's will. He got out of the boat to get into God's will.
This incident is recorded in Scripture as an example for us. God is calling us out of our boats to do things that we've never done before. The principles are the same as Peter's experience. To get out of the boat, we must ask God to speak to us. We must overcome our fear of the unknown. We must place our complete trust in Him. We must decide to leave our comfort zones. And we must commit ourselves to step over the rim with both feet.
Unbelief keeps both feet in the boat. Doubt takes one step out of the boat and keeps one foot in. Faith steps completely out of the boat.
What is God calling you to do? Take a step of faith and trust God. It will be much more fulfilling for you to walk on water than to stay inside your boat.