There's a confidence that comes from youth and not knowing better. But there comes a point as an actor when you do know better and that is when the fear starts.
So fear helps me from making mistakes but I make lot of mistakes.
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You know I never used to be a bad flyer but I did start to have a fear of flying after I shot a movie where I was terrorized on a plane. I made Wes Craven's 'Red Eye'. I don't think they're linked but it does make me pause and wonder if they are so perhaps I will explore that in therapy some day.