Peter said to Jesus, "Command me to come to You on the water !" He wasn't getting out of the boat until the Lord called him to do that. Don't go and jump out of your boat and then expect a miracle from Jesus if He hasn't called you out of the boat in the first place.
Peter, the outspoken, now is ready to step out on water! As Adrian Rogers phrases it, "Peter wanted to share this victory with Christ. Please put under my feet what is already under Your feet. Peter is not seeking a thrill. There was something about Christ that drew the heart of this man like a magnet. He wanted to share that victory with his Lord." What is under His feet??? ALL THINGS."