BECAUSE YOU HAVE ABSOLUTELY NO SERIOUS RESPONSIBILITIES OR OBLIGATIONS! I'm only 20 but I would do anything to trade in my responsibilities for awkwardness and pimples, body changes and insecurities. Are you kidding me?! Wait till you're in your senior year in college, have to worry about internships, grades that ACTUALLY matter, paying for school, paying for car, having car problems, insurance ending soon because you're getting to 21, roommates that are absolutely disgusting, and real relationships. Trust me, when you're graduated, you'll WISH you were 16 again. Nothing is serious when you're a teenager, even though you honestly think it is. Get in the real world.