at your age i wouldn't worry at all about height requirements or physical fitness (well dont' go and gain 200 pounds...but don't go and become a body builder just yet either). what you need to do if you plan on becoming a pilot is focus on academics. gpa and extra curricular activities are extremely good things to have as pilots these days.  then towards the end of high school you need to decide on which area you want to go into...navy or af and start preparing physically. i don't kno much about navy but if you want to be an af pilot you either need to focus on getting into the academy (grades grades extra curricular and grades!) or performing well in rotc while getting good grades in college. after that if you did well you'll land a pilot training spot.