"Fake it till you make it" is a saying I like to tell myself whenever I'm feeling low in confidence. My mom used to tell me this all the time when I was very young and I have continued to say it to this very day.
As of recently I've been faced with some difficult situations. Nothing life changing, but definitely moments that had me feeling very small, incapable, embarrassed, even stupid. We all experience this in life. It's these moments that make us stronger. It could be something as small as having a difficult conversation, to something major like speaking publicly at a corporate event. No matter how nervous or scared you may be, they key is to keep it a secret. No one needs to know how you actually feel. Trust yourself, keep your chin up, rise to the occasion and be amazing.