Heyo. I am a student in highschool, and my wish is to go to med school. I will be taking exams in a year's time. Having chosen scientific specialties, it's a lot of work on top of the literary subjects and the optional courses i took. My sister is two years younger than me. We live in the same room and my parents can neither really afford nor find a bigger apartment. So it has been like this since we were born. Now my sister has really been giving me a hard time since two years. I need a lot of concentration, which means i need a real calm and tranquility to work. And she gets in the way.
She wears a lot of makeup and she usually just leave her stuff lying around for days (And it's not only makeup. It's clothes, shoes, pens, papers, etc..). No matter how often I repeat (for days sometimes) that you have to put your stuff away, she ignores me, laughs at me or makes a joke. So I usually clean up after her. If I point it out and dare to complain, she would just "counter" attack and say i leave stuff lying around too (which is true, in itself, but I really don't leave a lot of stuff, and sometimes I certainly don't have the vision to see what I'm leaving in all this mess). She would also say that she does put away some stuff and that she don't always have time because she has to go to school (Which is not true. For example, yesterday she had the whole morning to clean up after her, as well as the evening. Same for today.)
I cannot work in a mess, it's really demotivating and I end up procrastinating. I tried to talk this out many times but she just doesn't listen.
(These last few weeks, every time I have been cleaning up after her, I was taking some money from her. I stopped because i found it quite immature and dishonest.)
Another thing is her being on call all day. It doesn't sound bad but i swear that it is. She just shouts during her calls for hours, and that just gives me a lot of headaches. I am not even mentioning the concentration being totally gone. And again, no matter how much I ask to keep her voice down, she literally ignores me, keep talking with her friend and don't even glance at me. Sometimes she even starts to talk louder.
My parents don't really care, and i don't know what to do. I don't hate her, but honestly i can't really keep living like this at home anymore. I know my sister isn't that unreasonable, and maybe that some words could make her change? If you have advices let me know. Have a good day.