Flying for the guard straight out of high school is not going to happen because you need a bachelors degree from a college university to be a pilot in the military, including air national guard. Also, joining the North Carolina guard is not going to pay for Embry Riddle because the guard only plays for tuition in the state you are serving in, so you only get tuition assistance for North Carolina State schools.
Follow your dreams, and research the best way to get to your dream. If you plan on going the civilian route, I suggest going to a cheap state school, get your bachelors degree while paying for flight training out of pocket, even if that means working two jobs and staying home with mom and dad for awhile. There really is no cheap way to pay for flight training, I wish there was. If you are looking to just join the guard for a free ride to the airlines, back away now, they see right through that and you wont become a pilot, you have to want to serve your country.