God created each person uniquely and did not create anyone as "junk". Jeremiah initially saw himself as a child, but God said not to say that and instead to agree with what God says about you. It is important to allow God to develop the character within each person according to their stage of development, from embryo to senior adult, and not to compare oneself to others or hold oneself back from what God intends. We should rehearse what God says about us so it becomes like a character trait we practice and master.