Can a girl practice bravery by watching a horror movie alone?

Don't use this method. In fact, there is nothing to be afraid of in this world. What's there to be afraid of going to the toilet? You tell me. As for the problem that "too many speakers make you nervous", you should try to talk more in front of many people and give yourself more opportunities to face. You can take part in the school speech contest or something, and be bold. After once, you won't be afraid. Take your time.