Im on the verge of hating my mom

I cant stand my mom. I know she should be one of the people I care for the most. I should be able to talk to her about anything or it not be uncomfortable when were in the car alone. Honestly the only reason Im "on the verge of hating her" is because she IS my mom. Ive kmown her my whole life shes made sure ive had a roof over my head and food to eat. But i just cant take how much shes ... sunken. My mom has no motivation to do anything at all. She barely cooks dinner three times a week. The house is always disgusting she never cleans. I have a seven year old little sister and thirteen year old brother. Iam the only one cleaning and its tiring cleaning up after everyone every day. I hate being anywere near my house i hate it so much i cant stand it. My mom is a single mom and she has been for about 6 years my dad lives in jamaica he doesnt make enough to send any money. I know i cant completely understand what shes going through but iam the oldest and everything she cant handle goes on me. I took care of my little sister she called me mom sometimes and it just killed me. I wasonly in 6th grade. She just doesnt do anything anymore at all. At all! Shes a house cleaner she only works about three times a week. She does the bare minimum to keep us afloat and thats it. She spends her days on the coach. Everytime anyone comes over you can expect her to be on that couch. I want to set it on fire. All she buys is junk food theres never any water around. We are both over wight i really want to change. I cant do afterschool sports i have a job on the weekdays. Shes becoming a drunk and she smokes two packs of cigarettes a week. Everyday i come home miserable amd go straight to my room. Its the cleanest room in the house and i feel so bad for my little sister because she didnt know the old mom. No one in the house is happy. Ive talkedto her so many times telling her she need to go to therapy or do something productive. She wont admit that somethings wrong and ahe doesnt listen to what anybody has to say. Like i dont know what to do anymore i cant do this. Im not happy. I dont want to be selfish but no one deserves to be unhappy everytime they wak into their house. Ive gotten to the point where everything my mom does irritates me were i want to rip my hair out. I hate her personality i hate the way she talks i hate how she drinks i hate everything about her. Ive threatened to move with my gramma a nd she justs says i dont care , good, go ahead. Wtf like seriously!? She made no reaction she put her head under the covers. The only reasn im staying is for my little sister. Someone has too make sure she brushes her teeth and gets her ready in the morning. I dont know what to do. I graduate in 2015 i dont want to have to live like this anymore. I feel like im the parent and shes the child! Im the one telling her to get up in the morning and to clean up after herself. I cant take it.im beco.ing depressed. It makes me sick that i cant say my moms a role model or i love my mom so much. I just cant. I hate her i really do. I sometimes feel like im blowing this out of porportions and i know that other people have worse problems and i should be grateful i dont have it like them. I am grateful that im not beat or abused. But all i want is to live life carefree while im still young. Why am i worrying about my mom taking my paycheck to pay for the rent because she doesnt feel like going to work. I hate my mom and what shes putting me through. Is that normal? Am i being an ignorant spolied brat?