When is it going to end?

I am not Wonder Woman, I do not have super speed or super smarts. I am just a regualr human teenager who is trying to get everything done in my life. So why is it then that teacher's think we can do everything? It's like they expect us to have no other life besides school and homework. Yes I understand they are just preparig us for College/University but still. I have had so much history homework it could last me a lifetime, and for what? So I can basically learn the same thing I learned last time just in a different wording? I have been a very busy person my whole life. What with swimming 11 hours a week, youth group 2 days a week, cuba meetings on sundays, somehow finding time to hang out with my friends, working every weekend for almost 10 hours, going to school and homework on top of that. Somehow in all of that I also find time to sleep and eat. So seeing as how my schedule has always been quite hectic I have been fairly good at time managment and getting everything done in order of importance. But this is way to much. I think that I am going to crack if something does not stop. The only problem....I can't stop doing any of these activities.