Perhaps you think of yourself as a little person, with very little to bring to the Kingdom. Take courage: God can produce an abundant harvest through You. This is one of the ironies of faith: God uses the insignificant to accomplish the great. God's power ca produce results in even the most unpromising soil.
Not many of us are wise or noble; most of us are anonymous and far from extraordinary. Yet all of us can be used. And contrary to what we might think, it is because of our weakness that we can be used by God. God's power is also revealed in the lowest points of our life.
It's possible to be too big or proud for God to use, but we can never be too little. "Out of weakness", we are "made strong". By God's great power we can do all that He has called us to do. To experience God's power, we must first admit that we are weak.