We all have different passions for different things in life. Chances are that you, a Sunday School teacher, didn't always expect to be leading a class. In other words, teaching Sunday School hasn't always been one of your passions. First off, thank you from the bottom of my heart for your contribution. You have a valuable task in helping fulfill Jesus' command to the Church to go into the world baptizing and teaching. God uses your service, whether or not you always feel it working.