To answer your first question, Eagle scout is the highest rank in boy scouts.  It usually takes about 4 years to earn.  Service Academies like it because it shows leadership, hard work, and commitment.
Having a high GPA, being a class/club/team leader, playing sports, and being involved in community service are all positives.  You have a lot of time (until your Junior year) to succeed and improve on all of these things.  (If you wanted to, you could still join scouts and become an Eagle, too.  I joined in 8th grade, and so did my roommate.)  Just find activities you enjoy and do really well at them and keep improving your grades.