When do I make a difference?

Sometime I get home from a night of youth ministry and feel like I wasted the kids time. It frustrates me to be at the church all day and to end it with a very ho hum youth night. Nights like this make me question whether or not I really am qualified to be a high school pastor anymore. I know I shouldn’t get to down on myself because its not about me but I can’t help but feel that I don’t have what it takes anymore. But, isn’t that the point. If I had what it took then it would be a lot more about me then about God. I need to spend a lot more time praying and asking him for guidance than I do. I guess nights like this are partially meant to convict me of that.