If you want to make your greatness known, the fear of criticism is just part of the process. One cannot take the good without the bad.
All my teachers were gone, now it was up to me to impersonate them & reign in defiant youths. Big boots to fill for an introverted accountant that's always been told he needs to, "come out of his shell." I felt insecure & inadequate.
Making the move away from Corporate America and jumping into the vast unknown has been the best decision I've ever made in my life. I've learned more by doing rather then years sitting in a classroom (or standing in an office).