Perhaps I can reassure you that Bible characters were also scared in the face of God?
But that was not the end for either of these men. Moses was used of God to deliver the Israelites from Egypt and Gideon followed the Lord's direction to dismiss the Midianites from Israel.
I advise you to confess your fear to the Lord. He already knows what your fear is. Pray and tell Him that you want to accept His Gospel, but that you are afraid. May the Lord reassure you and guide you towards the truth that you need.
Perhaps it may also be wise to talk to your parents or pastor about this fear, whatever it may be.