I saw a video on Wimp the other day http://www.wimp.com/bodylanguage/ about the significance of body language.
Take-away point: you fake it until you become it. Practice standing straight, hands on hips, and other types of “powerful” poses and the chemical reactions in the brain that occur as a result of it help to “be(?)” more confident, even if you don’t feel like it. Please check out the link for appropriate terminology and wording and exactly whatever is happening is called.
I’m going to try it out for my teaching 🙂 There are teachers who have taught for over a decade and still speak about not being confident enough to be observed, say something, etc., and although they are great teachers, that statement almost seems to diminish their effectiveness. Hopefully this positive body language concept will be helpful.