Oldest daughter of a middle eastern household. help.

I am the oldest child and oldest daughter of a middle eastern household and I am exhausted in every way shape and form. I carry the entire house on my back and I don’t even get a thank you. I hate being the oldest child, I hate it with every fiber of my being. It is not rewarding in anyway. I have had so many responsibilities placed on me ever since I can remember. I was always the responsible one, the most mature one and it has yet to come in my favor. Instead, they take advantage of that and place even more responsibilities on me and I am so tired of it. I literally remember being like 5 years old giving up my pink sprinkles donut because my sister wouldn’t stop screaming about wanting it. And I ALWAYS sacrificed it for her. It’s not about the damn food, it’s about the principle of it. And the donut is one of VERY many examples. Now she’s a horrible stuck up teenager who dosent care about anyone but herself and all she does is slam doors and bully the shit out of me and claim to be the fucking victim when she has harassed me in every way imaginable. She dosent give a damn about me even if I died, she’ll probably be relieved if anything. And trust me I know how it is being a teenager, I was one not that long ago and I completely get it.

But she’s gonna be 18 this year and she has yet to change her ways. She got away with all the shit I would have NEVER gotten away with when I was her age. she does heinous shit all the freaking time and gets nothing MAYBE occasionally she’ll get yelled at but that’s IT. I literally got death threats from someone telling me to cut myself and to kms and all this horrible stuff and I know for a damn fact that it was HER or she sent some to tell me all this stuff. And how do I know? It literally happened like 20 minutes after we got into an argument. She pretended to be clueless about it and all my mom did was yell at her and that was it. Not even for that long. If something like that EVER happened with me, not only would I have gotten my phone taken away from god know how long but I would get punished so severely. And yet she gets away with it every single time and it seriously makes my blood boil in a I can’t even begin to describe. And I wasn’t even a bad kid. All the damn time I get told that I was such an easy child this and that and yet I got punished for so many stupid shit that I didn’t even start half of the time. And yet she got NOTHING and she freaking dares to act like a victim when I’ve done nothing but be good to her meanwhile she couldn’t give a damn if I were to drop dead infront of her. I have tried countless time to Fix our nonexistent relationship and I have officially given up because all she does is push me away and continue to act like I’m the problem and she refuses to take any accountability at all.

And the worst part is we’re expected to live completely alone together next year for collage and i genuinely don’t know if I can do it. She is the most inconsiderate person there is and trashes every corner of the house and dosent clean thing, dosent respect me in the slightest and I know she wont wanna help pay for anything (she’ll be getting money every month for reference, WITHOUT working mind you). I’ll be living with my actual bully.

I just wanna worry about myself and myself only. Is that too much to ask? Is it a selfish thing that I wish I can worry about my own life and my own health instead of everyone else’s? And if anyone knows ANYTHING about a middle eastern household, there’s no such thing as moving out alone so I can’t even escape this hell even if I tried. I’m so tired. Im reaching new limits everyday and i genuinely can’t continue living like this.

Oldest daughters, middle eastern oldest daughters, any advice please? Anything at all? Or will this just be my life until I decide I wanna get married and spend my life with an incompetent man instead?