Im 14 years old and i want to become a serious actress?

You can be anything you want to be if you put your mind into it and try hard to get there and never give up. If you're on stage and you get shy just tell yourself that what you're doing is something normal... just tell yourself "this is who, I am and if someone doesn't like me then too bad for them". Don't be shy or scared. You could do it. Good luck