Hello, I am too on a similar quest, I am in 10th grade and have done extensive reseach. You must excel in Science and Math classes, be Physically Fit, being able to do 1.5 miles in 12 minutes, 50 pushups and situps in 2 minutes. They also look for a whole person to be a fighter pilot. This means, intelligent, plays sports, has an after school activity that benefits the community like Boy Scouts or Girl Scouts. Your grades should be in the 90's, you just don't automatically become a fighter pilot, your put in a class of 8-10 and then they take the top 2-3 to become fighter/bomber pilots, the rest become refuelers or transport pilots. You must have a set mind and be committed. If you have most of this you have a good chance.
As for your leadership, join the Student Council. Volunteer work is a MUST! to have a high chance of getting in.
Talk to any Military Academy Recruiter, not a Liason, it doesn't matter what Academy most have similar requirements, I met with one from Westpoint, I told him my current everything and what I'm doing. He told me to get my Eagle (I'm in Boy Scouts) He said an Eagle in your application is a Super Plus for chances getting in. My grades were fine, and he wanted me to run more. So all you need to do is meet with a recruiter and talk to them. They should get you set.