Is WW3 really going to happen?

I am really scare. I am only 14, and I've heard about WW1, 2, but lord, numero tres? I'm scared to death. I've heard about these wars, and they are big and serious. Is it really going to happen? Is america going to be overun???? I need explanations, none of the grownups tell me, and they switch the news channels from the topic when I am there! I am scared!!!