I've had my heart set on being a pilot since I was very little; I'm very passionate about aviation and aeronautics, I couldn't imagine ever doing anything else.
The only true guaranteed way to become a Military Pilot is to apply to Army WOFT, if accepted you are guaranteed flight school. The only caveat is that you would be flying either Apache, Chinook, or Blackhawk Helicopters, or a C12 fixed wing.