Hellp swine flu question..?

i heard about it i go to school so what if i catch it i know theres no cure for it yet because its a mutated virus im sure someone in my school has it i mean out of 2000 people of course someone has to so i know you have to always wash ur hands and everything but what if i get it i heard ur imune system attacks itself and u die so is it deadly is it THAT dangerous?