How to overcome shyness and gain self-confidence?

So in the fall, I am attending a performing arts high school for theatre. You had to audition and I guess I did well. I am sort of shy. I want to be more outgoing or else I won't do well with theatre. This is my first time doing theatre. I want to gain more self-confidence because I worry about what people will... show more So in the fall, I am attending a performing arts high school for theatre. You had to audition and I guess I did well. I am sort of shy. I want to be more outgoing or else I won't do well with theatre. This is my first time doing theatre. I want to gain more self-confidence because I worry about what people will think and everything. Do you have any tips to overcome my shyness and gain self-confidence? Also, any acting tips would be greatly appreciated (since it's a first time thing and I'm worried). Thanks so very much in advance :D
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