But I managed to simultaneously enjoy school a lot and learn to self-educate. These things aren't mutually exclusive by any means. All good education is self-education, and a good school is one that operates with this principle in mind: The teachers and the environment should amplify your self-educational tendencies, not thwart them.

Mind you, you'll never find a whole school, of any size, that works that well. (Especially in high school, and especially these days, when my understanding is that school is more regimented than ever.) You have to find the special corners.

You should take classes that help you. One rule is simply to study any subject that has a good teacher, no matter what it is: Ask around, find the teachers that are any good, and learn from them. Another rule, which I suggest often around here, is to take classes that incorporate resources that you won't find on your own. Guitars are easy to find on your own. Entire student symphony orchestras or choirs are harder to find, and fully-equipped semiconductor wafer fabs are the hardest of all to assemble in your garage, unless you're Bill Gates.