Finally the day has arrived. The opportunity (机会)you have been waiting for is here. Years of musical theatre college and training have led up to this moment. You've waited in line for hours, and you're next up.Only a minute ago, you were very cool, but now your breathing is speeding up, your heart is beating heavily, and your hands are beginning to sweat (出汗). What's going on? You've got stage fright. Stage fright is also known as performance anxiety (焦虑), and like most anxieties, it's about your brain and body mistakenly believing that you're in danger.When you get frightened, your body wants to fight or run away — and that can get in the way of all kinds of things, including performing.