Ever seen this lady? A superhero of her time, Wonder Woman.
I recommend you watch the TED talk on the link below. The Wonder Woman pose is part of the psychology research discussed. What's the relevance to me I hear you say! Well, your body posture is crucially important.
Just by standing or sitting up tall with your head held high, like Wonder Woman massively boosts your confidence and self belief. So go for it, stand tall and solid like a mountain and you'll feel so much better, like you are ready for almost anything. Body posture is key.