Ok here's the deal. My mom has been pressuring me to pick a career already, and I know I'm not going to pick anytime soon, but I thought I would ask a question about one of the things I'm thinking about. Ok... I would love to fly a fighter plane for the army. Now the question is, what do I have to do to get there?

While there are a few planes in the army, most fighter planes are in the air force. And of course you will have to be a air force officer. So you will have to go to college at least in the ROTC, or to the air force academy.
Also there is a lot of competition for the slots, so your college grades, and your physcial condition will all be judged. And as you go to be a pilot you may not be doing fighters, but doing transports, or refulers, or other air craft for the military.

How old are you ? Carrer is not something you need to worry about till toward the end of your high school.