When God created us, He created us for a special purpose. With a unique set of skills, talents, strengths etc.
So when God calls us to work for Him, He simply asks: “What’s in your hand?” Just as He asked Moses (http://bit.ly/2D4J8Cg). Whatever skills, talents and strengths you have already been blessed with, can be used for the kingdom of God!
Sometimes we feel so insignificant, and not worthy enough to be used by God. But like Moses, we shouldn’t be focusing on what we can’t do, but on what God can do through us!