My parents favor brother?

My bro is 15 and im 12 and yeah. So like today it happens everyday, my bro was being really mean. He was using his Lego's and making as much noise as possible while I was watching tv so i said could you be any louder. He then started shaking the box so I ignored it and didn't look at him. Then he stopped and was like Yes, I can. So he goes out to work on our deck with my Dad. Im writing and reading for a next year project. He comes in and says get me a soda. My moms also sitting right next to me. I said fine, got up. He usually drinks 7up or sprite so i went down and none were in the fridge so I just got him a room temp. Then he grabs in and is like. You idiot who would want a warm soda. And I said sorry. He threw it at me and said get me another. So i said no. Then he just stood there. I walked away and he scream I HATE YOU. My mom was like shut it to me! Then my bro told on me to my Dad who is the one who really favors him he comes in and is like what with the soda thing. And i said i got him a soda he wanted a cold one but he freaked out and wouldn't say please or thank you. Then my mom looks at me and is like your being a real *** lately. So after like 5 minutes i went up to my room. why am i the *** when yesterday i helped clean the whole house scraped gunk out of the sink and shower then went shopping with her helped with a giant yard sale a week ago and im the *** when my bro always tells me to shut up,go away, *****, and hits me. My parents act like oh nothings wrong hes a angel ever since he got a stupid job. Other things like if we get into a fight my Dad blames it on me. If my bro does something bad my mom laughs about it were as if i do something wrong im useless and no help. I can work on the deck because my wrist is sprained from working on the deck and im only 12 sorry i don't know how to use a power drill. I don't get paid for chores he does. If i get a 90% percent or lower on a test i get screamed at. If i get 100% i get a it easy to get a hundred all you have to do is show up. My brother got a c in math and my Dad was like its high school its hard. Then i get straight A's every single marking period but then in the 4th i get a 89.4 in math one little percent from a A and my mom freaks. One day I was cleaning my fish tank and my moms like help on the deck so i said i can't im cleaning the fish tank. Shes like there dumb fish do something important. She blames me for messes that she made. She screams if i do something wrong. My brother shredded my 200 page story and no one cared. I wanted to play piano and my mom crushed that dream. My Dad told me I could never care for a living thing.My mom insults what i wear and how i look. Yet my friends thinks i have a perfect like cause im always hiding this. So it like the don't noticed that I help but they notice my brother helping. they pretty much think im useless and friendless. Im close to hating my parents and i would rather go to some military school cause in school i don't have to worry about them.