It definitely wasn't a waste of time. I finished college early because of all the skills I attained in high school and that was a godsend for my wallet.
You're getting free education. Take it for all its worth. If stuff is easy and you know it all, then you'll glide right through high school, get your diploma and be out in the world reaping the benefits. I started saving for my college education when I was younger than you are and I can tell you how much it sucks to have to pay your own way through an education so, enjoy the one you're getting even if the social situation's aren't to your liking. Yeah, high school sucks but that's just cest la vie you're not the only one disliking their situation.
And if you want to ditch high school by all means quit the school system, but I can't see a benefit in forsaking one flawed system for another. Every system be it work or school has flaws and regulations you won't agree with. That's really just how life works. If you quit every job you felt had flaws or was too sociable you'd never have a job or stable living. That and well, lets face it the economy still sucks, and its even worse for high school drop outs so your best bet, is just to stick it out until you get that validating piece of paper that says 'yay you did it, NOW go get a job'. It's just easier to have that piece of paper.