my father didn't finish 2nd grade. He's not illiterate NOR ignorant. he actually retired recently after opening a successful business for 25+ years. he's living off his investments, and guess what? he makes, as a retiree, 2.5x the average house hold income. so its a matter of perspective and person.
I suggest you re-read your question - word for word. Did you do it, yet? Good.
Did you notice something?
I bet you didn't, but it is there anyway.
You are reading. Not everybody has that skill. People who cannot read would LOVE to be able to go to school to learn how to read. Embrace that skill for which you take for granted. Do not eschew it. If you do not know what "eschew" means, I am sure your teacher has taught you how to use a dictionary.
So your parents can go to work. You certainly can't be staying home alone. Plus imagine how this country would be without it's members having a formal education. We cannot afford to be ignorant otherwise more intelligent educated people would overcome us. Well actually the corporations own us now. As a people average American people need to use as much smarts as they have to overcome the giant.
so you can learn stuff like 4xy +34= 5y + 36. you will use that all the time in your life! seriously though they teach some things you may need but I agree that school should be focused more on life skills and not crap you will never use again.
So you can learn and know lots for when you become an adult. If you did not go to school you would therefore not know anything at all about what you are learning in school now, like the most important ones like reading and writing, if you didn't go to school to learn those two most important things (even though your parents teach you those things you go to school to do them better) than your entire generation of family after you will not know how to do those things later in life. You also go to school so it can help you be educated so you can get a good, efficient job later in life so if you didn't go to school you wouldn't be educated so you would have an extremely hard time getting a job.
So you can be groomed to accept others telling what you should know. What you learn in school is subjective. One could argue what you learn OUTSIDE of school is the real life lesson.... Seek the truth :)
So that your brain will be full of knowledge and that can actually be healthy because it can reduce your chances of developing a mental illness such as depression, Alzheimer's, etc. I learned this in psychology class. School is the place to exercise your brain. Plus the more educated you are, the better chances you'll get of getting a good paying job in the future plus people are attracted to smart people. You want to show people how smart you are and how proud they will be of you. School is a great place to find relationships as well. Personally, I am in college right now and I'd rather be here than stay at home all day because I find that staying home all day gets boring. Learn as much as you can. People will be proud of you for your high level if intelligence and you've got a bright future ahead of you if you develop a passion for learning.