What will happen to the American people and economy if our debt gets too high and/or we default on it? BELOW?

ME AND MY DAD ARE PETRIFIED!!! The US has never defaulted on its debt, and if it does, I don't wanna die. I mean, our money will be worhtless, no one can buy anything, the other countries would collapse and a nuclear war would start. I don't wanna die cause of nuclear war or from starving like in Africa, Im not even in college yet, and if they don't work it out i might not get the loans to next year. Gerald Celente says we're doomed, I''m scared..HELP!!!!!