This Ted Talk is just over 20 minutes, and so worth your time.
From my clients, to coworkers, I've quoted this talk. Amy Cuddy, PhD, has studied how body posture can influence the way we feel. Go ahead, try standing in a superhero pose, hands on your hips, chest out, shoulders back and head held high, and not feel confident.
You have the power!! "Fake it until you become it"!