As an active teenager, you may not need to squeeze in vigorous workouts into your already busy schedule. Make sure you stick to eating healthy - this is hard to do for people that are always on the go and out of the house. Pack healthy snacks and eat sensible meals.
If you insist on keeping up an exercise routine, perhaps you can squeeze in 20 minutes of a workout just before or after school a few times a week. But don't over do it.
It sounds as though you're very active already. Keep your academics and and your school activities FIRST. Don't tire out with tough workouts and bail on your other more important endeavors.
You'll really need to be tough on yourself to stick to a workout routine when you get to college!! That's when it's really going to count.