Let me just start off by saying that what you want to do isn't easy and never will be but I can promise that it will ALWAYS be worth it! Every time you finish a performance, are accepted to a program, or are given a role, the sense of accomplishment you will feel is unlike anything else- embrace it! Never lose sight of why you chose this path.
Take every single opportunity possible! Sometimes you will find yourself in situations where you need to make sacrifices- choose between your career and your family or friends, you'll need to stay flexible, and most importantly never lose sight of why you chose this path.
Work hard. As I said before, this won't always be easy but it'll be worth it and there is so much truth to this statement! If you expect to have everything handed to you without having to work, you are sorely mistaken.This will take a lot of work- hours of searching for music, working on characters, practicing, rehearsing, etc and I can promise you it will NOT be easy. But never lose sight of why you chose this path.
Ignore the naysayers. Choosing to become a performer isn't a traditional career path and I've found that often people will encourage you to take a career path that is more "stable" and traditional such as business. But the truth is that you've chosen this path because it's what you love to do and it's what you are good at- not because it was the most practical. I firmly believe that if you love what you do, you can and will find a way to make a living doing it! Never lose sight of why you chose this path.
Always love what you do. Know that there may come a time in your life when you no longer love performing and please know that it is perfectly OK! If you ever feel that you don't love what you do, if it's performing or not, find something else to do- something that you love. Always always ALWAYS love what you do, no matter what!
Never lose sight of why you chose this path.
Best of luck!