I like to know I am good at something before I do it. Who wants to try something new and fail?
If you feel the same, you're choosing to live in comfort. A place where you know you are good at what you do and don't have to worry about making a fool of yourself.
While comfort feels nice, you will never grow into your full potential if you stay there. Get out of that comfort zone. Try something new and fail. Anyone who's done anything important in this world started out by feeling like they were in over their heads.
It's time to get uncomfortable.