Yes, think twice.

Think twice about the opportunities you will have in the US to prove your worth, follow and achieve your dreams, have fun while doing it, kick some stereotyping-idiotic-lost in history-self-doubting-cowardly butts in the process, and live your life the way you want to. Think twice about the doors that will never open in other countries. While you are at it, also think of a little somepin to suport yourself once you get here. You don't need much money as such, but you sure do need a plan based on enough and accurate information to tide you over the first few years, and thinks will usually be alright (unless you screw up royally.) Think twice about that too.

And dont't think twice about kicking nay-sayer asses!