Believe in yourself
Do you know what's does these famous people have in common ?
They had made their Dreams come true.
Because they Don't Give Up (in-fact the word "Give up" is never never in their vocabulary) , they believe in themselves.
I can do it, I will succeed, even if I failed, I will take it as a learning lesson, learn where I go wrong and continue to work on it. Believe in yourself, Trust yourself. You can do it.