Have you ever felt called to do something, but after giving it some extra thought decided you weren't "qualified" or "good enough" for the job? It could be anything. Maybe you felt a nudge to serve in your local church, homeless shelter, nursing home, etc. Maybe you've always wanted to volunteer in your kid's classroom, or offer help to a neighbor. Maybe you wish you had a different job - that "dream" job. Then you second guessed yourself and it became a distant thought, at best.
Well, I heard a phrase the other day:
God doesn't choose the qualified, He qualifies the chosen.
What does that mean anyway? It means if you truly feel that God is pointing you in a direction - that He has chosen for you - that you feel you aren't good enough, skilled enough, had enough training in... it doesn't matter. God will pave the way for you. You just need to make your next step the first step. He will take it from there ;)