I've come across a very intriguing concept that could have a lot of influence on our performances and self-confidence. If you have an extra 15- 20 minutes, google the link below, about body language. We know that how we sit, stand, and carry ourselves has an influence on others who are observing us. But did you realize that we are unconsicously influencing ourselves at the same time? I think you'll find this TED Talk helpful in your singing and your life in general. D.
TedTalk Amy Cuddy "Your Body Language Shapes Who You Are".