Change your path NOW. Find something you wish you could do and try to learn to do it. Go to college (can't afford it? Ask for help from Financial Aid) or learn from home. You can learn a lot of things online and through books. Some jobs require a college degree, so if you're aiming for something like that, you should get started.

I'm twenty years older than you and let me tell you, the older you get, the harder it is to change your life, because you start seeing how few years you have left to learn, live the life you want, and still be able to physically do it.