What do i do, im being treated VERY unfairly.?

I have a Younger sister who is 10. It seems like my parents think she is perfect and they treat her like she is the most important thing. Its hard to explain. She basically gets whatever she wants and gets away with everything/anything. She can brake a window, my parents will say its ok. If I brake a window, ill be grounded for a month. She is ALWAYS having her friend over (every other day), and the last time i had a friend over was when i was 12, 2 years ago. They say my friends live 'too far away'. My closest friend is a couple blocks away, but her's is across town. We have this thing, were if u call it first, you get it. Like Today, we are going to Oneonta so she can get a new bike( Can I get a new bike? No), i called front seat first, but then she said: "NO! I get front!" And I asked, "Did You call it first?" "No," "But i called it first!" "TO BAD I STILL GET IT!" She NEVER has chores, i do! If she has to clean the cat litter, she will say "I dont want too" and not have to. If i have to do the dishes, I HAVE TO no matter what. I could be sick with the flu and still have to. She could be sick with the flu and still have her friend over. She has a huge party for her birthday every year, and i didnt even get a cake. Whenever she has a birthday party thats at our house, i cant go near it i have to stay in my room because 'ill disrupt the guests fun.' but when I have a party, she can invite all of her friends over. She loves to fight me, physically fight, and whenever i walk towards her, she trows herself on the ground and covers her heard. If i dont want to fight, she goes: "Oh Your too scared! Your a little scared baby aren't you!" She refuses to go in the basement and/or upstairs alone. She claims its because she doesnt want to, and shes' not scared. Yet if she does, she comes running down the stairs. If i dont want to because i can be quite lazy at times, she calls me names. She knows that the sound of people chewing with their mouthes open annoys the living crap out if me, so if i dont do anything she wants or i do something she doesn't like, she pretends to chew with her mouth open right in my ear. My parents tell me to just suck it up and act my age. My parents dont like Justin Bieber, yet, they let her and her friend blast his music and they dance to it at 10 pm. They dont like metal/rock (the music i like), and they dont let me blast it. If i have my headphones on, they make me turn it down so far that i can barely hear it. If my sister and/or her friend see's something they want in a store, THEY GET IT. If i see something I want, even if its wayy less than what they got/get, i cant have it. My sister gets to drink things like Dr.Pepper, Mt. Dew on school nights, but i cant. I get bullied alot in school. I basically hate my life. If something goes wrong or gets broken, i get blamed, even if i didnt do it. Sometimes they even just blame it on me just to have someone to blame. My sister can punch me, and lie and get away with it. My friend just died because of suicide, and my parents tell me to get over it. Its basically like she is Cinderella, and gets treated like a princess, and im the ugly step sister( i've gotten told by her that im ugly.) I've gotten to the point were i just want to kill myself, and i debate at least 3 times a day if i should or not. I've cut myself before. I just want help before its to late.