Unless you really, really know what you want to do after you drop out and the passion and dedication to pursue it, and all school is doing is wasting your time and preventing you from pursuing that goal, and possibly at least a way to make some money, I suggest staying in school.
I understand where you are coming from, I really hate school as well, to the point where I really do think it wastes my time. I have just never functioned well in a school environment, I'm pretty sure most people don't, they generally aren't places that cater to a wide variety of learning types, personalities, ect. Some just push themselves through it out of fear of not having a good future, or because they want to live up to their parent's expectations, or their expectations. Some people fool themselves into thinking that school is the epitome of achievement, that if you don't perform well in school, or don't like it, you aren't intelligent, or you can't be successful. Some people are actually comfortable with school.
Some people, like yourself, just can't put themselves through it and give up, because school really does suck at what it is apparently set out to do: Teach and nurture talents. When I was young and in elementary school, I was ostracized for being eccentric and for straying away from the inflexible structure of school. I didn't learn the way I apparently supposed to, I didn't want to do assignments the way I was apparently supposed to, I instead wanted to try my own ideas and approaches. But curiosity and creativity, to them, just got in the way of plowing through the set curriculum as efficiently as possible.
The problem is that school, in the way that it's designed, just doesn't work for everybody, but our society puts so much importance on it to the point where it's needed merely for survival and practicality.
If I wasn't in school, I would have more time to learn about and pursue what I want to do in life. But alas, I lack both the dedication, bravery, and probably the talent to do that so I can overcome the many obstacles society throws at people without a formal education. So here I am in school. It's not completely terrible though, I'm going through my last year. After I graduate I'll take some time to clear my head and really figure out what I want to do.