How should I deal with all of this stress from high school?

How should I deal with all of this stress from high school?
Have a beach themed slumber party!! Hooray!!
I am a sophomore in high school, and last year was a breeze. This year my goal is to maintain a B in Spanish, science and math, and an A in English, AP psychology, choir, gym and art.
I'm already falling behind in my "B" classes (though still maintaining the B) and on top of all the hard work we do throughout the day, there are at least 2 hours of homework each night.
I also have to practice piano every day and I haven't been getting enough sleep.
It wouldn't be so bad for most people, I don't think, but I have always needed a lot of alone time to just be doing nothing, reading, writing, making / listening to music, drawing pictures, thinking, etc. I can't do this anymore because I don't have enough time, so I am under enormous amounts of stress.
On top of all of that, I don't have my own bedroom, there is no quiet place to go in my house and my parents are always yelling about something.
My parents are so strict about many unreasonable things, and though it usually doesn't affect me, there are some things that I do not understand at all, and when I go to question them about it, they explode. My mom also complains to me about everything in her life that is wrong (i.e. not enough money, not enough time, all of our family's medical problems, etc.) all of the time, so I don't even have enough time to think about my own problems.
I'm starting to feel so ugly from this lack of sleep and relaxation, and I'm breaking out so much from all of the stress.
I have this ideal life that I could be living and I have no time to even think about how I could get there.
What should I do? I just feel like I'm completely falling apart.
Thank you in advance!

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