I Think My Teacher Is Racist

So , I recently moved to a new school this year two towns away from where I live . I've always loved singing , acting , drawing and writing and my mother finally found a performing arts school that was right for me . When. I got there , they told me I could choose a major . I could'nt go into Drama , because I'd be missing out on singing and. I could'nt join Vocal because I'd be missing the acting part of it . So I was introduced to Musical Theater which had both things I wanted to do . I joined the class and within the first three weeks started to experience what I think is Racial Discrimination . At first , it started out small . The teacher ( who is a Caucasian male ) would give us songs to practice . I ALWAYS get songs from Color Purple , Dream Girls , and all of those plays that are associated with Black people . Then , he seemed to favor all the white kids in my class , by always giving them singing and acting solos . ( there are black and hispanic kids who have been in his class for years and are very talented and have never gotten a part ). Then , came our first play . I auditioned for a part that happened to be a blonde character , but when it comes to plays , I don't see color . All the white kids kept telling me , " You should be Mitch", who is the only black guy in the play . So I did research on Mitch and he is black with dred locs ( like me , only I'm a girl ) . He was ghetto , and unlike me in any way , and had very little parts . So I dropped him as a choice . Next thing I knew , I was cast as Mitch in the play , and the Asian lokking girl in our class( who is NOT Asian ) got the part of the Asian girl . ( according to the other kids , she always get the Asian parts ). So , I did speak to my teacher about how I felt including my loneliness ( at school , no one talks to me , including teachers ) . He said he wasn't racist and left it at that . Then , I auditioned for another one of his plays as the Latin American character , since I was the only one who could do the accen and voice . However , I got the part of the black woman , who has no lines and is nearly in the play at all . The hispanic girl got the part , and she can't do the accent . Should I say something about it , or should I just keep quiet ?

I recently turned 16 and am living with one of the biggest brats ever to come into my life . .....
                                                              My 13year old sister .
1. I go to school in another town , so I have to be up at four o clock in the morning and don't get home till 9:25 , so my sister is alone all day . When I come home , the house is a wreck , all the food is done , and the cat is left unfed . But one of the worse is that she goes into my drawers when I'm at school and uses all my perfume and opens everything , does her hair in my room , leaving it a mess , disrespecting important things to me like once in a lifetime expensive gifts and birthday cards . On my sixteenth birthday , my friends and mother bought me three bottles of perfume , which is a HUGE deal for me and all my family members know this . The other day , I came home to find one of those perfume bottles full of water with my other perfume emptied into it along with blue food coloring . I had to take everything I own and bring them to school to lock them in my locker because this is not the first time she's done it . Her lotion and perfume bottles are lying around the house because my mom and I respect her things and we have to hide  all of  our stuff. She dumped a big  glob of hair gel on a birthday card I received from my mothers boyfriend ! It's as if no one els is important to her

2. But don't get me started of the disrespect she has for my mother ! Without a husband , my mother has to work  for THREE adults to support my sister and I . She has to buy groceries EVERY DAY because my sister waste everything that enters the door. Recently , she told my mother
     " You can't control me ! You can't tell me what to do! " . My mother is trying to bring us back together as a family , but it's hard considering my sisters behavior and my moms inability to be home every night . Me and my sister are home by ourselves every night and I can't deal with her .

3. She put a lock on her door and broke off mine . She does what she wants in my room and monitors everyone who enters hers . She stole the laptop and it's hidden in her room .

            WHAT THE HELL AM I SUPPOSE TO DO!!!!!!!
I've tried talking to her , but she's not stupid and knows all these tricks. She's sarcastic disrespectful sassy and rude and I don't know how to cope with it