I think it's important to act as happy and confident as you can because not only does it make you look more confident but it will gradually make you FEEL confident! As cheesy as it sounds, you have to believe in yourself. I've always found it hard to take that phrase seriously because I never believed in myself. I try to now. Don't get me wrong I doubt myself a lot but never completely. If you believe that you can do something it will keep you motivated to achieve!
With confidence you've won before you've started!
Love, Chloe x