Then the Lord said to him, “Who gives speech to mortals? Who makes them mute or deaf, seeing or blind? Is it not I, the Lord? Now go, and I will be with your mouth and teach you what you are to speak.” Exodus 4:11-12
Would there be anything more clear than a burning bush before you that is not consumed and God speaking your name to show that He is calling you into action for Him? God has chosen Moses and yet because of his stutter and mild manners Moses does not believe that he can be what God is calling him to be.
"What if the people don't believe me? What if the people don't listen to me?" Moses questions. Then God reminds him Who made his mouth. Moses still asks for someone to help him and God sends his brother Aaron to speak during the times Moses is certain that his stuttering will impede the message God gives through him.
God has made your mouth, your feet, your hands, your heart. God is listening to your concerns yet He still uses you to do His will. God uses you because He has equipped you for the tasks He calls you to perform. Remember, you are but a portion of the Plan. God is orchestrating other's lives to stand beside you too. God's imprint upon your heart is His purpose for you.