It is a common feeling this feeling of inadequacy.
But we must move beyond it if we are to serve the Lord.
We are inadequate. Accept it. Believe it. It will always be so.
But also believe that God would not have placed you where you are, if He did not know that you were able in Christ to accomplish the task He has given you.
But everything that is accomplished for His kingdom is accomplished by inadequate people who have been empowered by Jesus.