how do i get my mother to leave me alone and give me space?

Okay so recently my parents split and it hasnt been easy for me. I’m the oldest of 4 and Mam asks me if everything is okay and I say yes when she asks me in front of the others because the look up tome a lot so i dont want to worry them but if were alone or the others are in bed i tell her that its not okay and that i feel neglected and used but if i say theres a problem she goes nuts and gives out to me! and then when i dont talk to her she gives out to me saying i never talk to her! i kow she is trying to cope with the split to but i still feel like she just doesnt care but i know she loves me! iam always left looking after my younger siblings when she goes out and stuff but i dont mind but if i look to go out shegives out and says i always look to go places which i dont! My younger brother and sister always ask me why were always fighting but i cant tell them its because she doesnt care! I have talked to Dad about it and he has tried talking to her but she wont listen to him either! I dont know what to do! please help! and because i dont go out i do ask can a friend come over and she will say yes and then like the day before my friend is suppose to come over she tells me no for no reason! it gotten that bad itry to avoid her! she is full of empty promises! and theres never food in the house and she does nothing to clean it and its all left to me! im 16 and while all my other friends are off enjoying their youth im left at home cleaning and minding my siblings! i cant do it anymore! i just cant! i need to get away from it but i have no where to go i dont know what to do anymore!! i wan to leave and head off to college next year and i really want to go to college but im considering not going because im afraid of what will happen to my brothers and sister! what am i suppose o do when talking to her doesnt work??