In this chapter, Moses is called by God to lead the children of Israel out of bondage from Egypt, better known as the Exodus. In verse 11, Moses says "who am I"? He recognizes that he has no authority in and of himself; however, he fails to recognize who God is.
God gives Moses the authority to lead Israel when He says, "I AM THAT I AM and tell them I AM hath sent you". God being the "I AM" means that He is self sufficient. God does not depend on anyone for anything, He is.
Many of us are just like Moses in chapter 11 wondering "Who am I?" Instead of asking who we are, we should acknowledge who God is and come to the realization that whatever we are is because of Him.
God is the "I AM" and He is all we need.