God doesn't call the qualified; He qualifies the called (1 Corinthians 7:17 ; Romans 8:28 ). The truth in the statement extends back to Moses, Abraham, Joseph, David, the apostles... just about everyone used by God for big things who, on physical examination, didn't have the degrees, stature, or qualification for the jobs that needed to be done.
You've never spoken in public, acted in a skit, or led a Bible study? You may be right where the Lord wants you, so get ready for Him to bestow His qualification upon you. It also works in reverse -- you think you're qualified for one thing, God has a different purpose.
All you need is a humble heart filled with His Love; Passion and intent to follow His Call and His purposes for your life.