There are few good reasons to go to school, especially public school. Unfortunately there are an overwhelming number of bad reasons.
Bad Reasons
Going because it's conventional. You shouldn't be afraid that not going to school will make you an outcast, or that not going to college will ruin your chance to get a job. If you are a truely ambitious and intelligent person, school will not cause you to succeed. It may help, true - however school can be much more detrimental to a person's creativity and innocent naivite.
Going because you are afraid. Afraid of what? Not becoming someone society wants you to become? Shaming your parents? Shaming yourself? Perhaps I am stating the obvious, but you should never do something out of fear. If you are going to school because you are afriad of what will happen if you don't go, you ought to try not going. Maybe you will discover something about yourself that you didn't know before.
Going because you don't have anywhere else to go. If your life is so mundane and empty that you go to school to fill that hole you have... well, that's just sad. You should really get some hobbies, some more friends, or have some interesting experiences (vacations or day-trips). There is more to your personality than school, and you are more of an individual than just a student.
Good Reason(s)
Going because there is something worth learning. Most learning is school is garbage designed to rot your brain. US History is a good example. However some classes are informative and if you actually enjoy the subject, then definitely go learn! Learning is a wonderful thing, just don't depend on school for it. There is a lot of learning that can be done outside of a classroom.
