This can be an extended period of instability in your life when you feel rebellious and independent, and very unwilling to just blindly, docilely do what other people tell you to do. You're still young, and you may already feel alienated from your parents and school authorities. It might really get under your skin, in fact, when your parents or your teachers pass off your feelings as simply 'acting like a teenager' or 'acting out.' But it's one thing to feel independent, and quite another to be defiant purely for the sake of resistance.
In the end, this kind of behavior won't help you achieve the self-reliance that you want. Your youthful perspective may make you think that all authority figures are out to get you, to make your life miserable and difficult; you might think they're asking you to do things that you can't imagine being important for your future. But as difficult as it is, try to accept that you don't know everything yet, and that those who still have some control over you may actually have your best interests at heart. Use this energy to become as independent and self-reliant as possible, but don't automatically dismiss the things your elders are telling you.