Despite her larger-than-life nature on social media and in interviews, Anna admitted to frequently flipping between "feeling painfully shy and being super outgoing" during her childhood.
The Hollywood star revealed she still suffers similar problems to this day.
She told the Daily Telegraph newspaper: "I get terrible imposter syndrome - 'this has all been a terrible mistake!' - and then there are times when I think I have so much more to prove."
And even though she is now one of the most in-demand actresses in Hollywood, Anna has experienced her fair share of setbacks en route to stardom.
She recalled: "I remember once coming back for round two of auditions, and the place was closed, so I was literally peering through the glass. It turned out my agent just sent me the call time from round one by accident.
"So yeah, there were lots rejections and I had to go, 'no, I'm definitely good at this, right?' It helped knowing lots of other talented people who were also not working. Sometimes it's just luck and timing."
- Bang! Showbiz
