It's so frustrating. I'm about to move out of the house in five months for college and she came back home after her lease ended (after saying she was never coming back) and now we're stuck living in the same room.

We live in the same bedroom and have been since growing up. She is 7 years older than me and therefore always had an authority over me, we never meshed well. Our room, which she left years ago, was essentially turned into my room. My room has all of my belongings. When she came back two weeks ago, she took over my vanity desk and threw her clothing on the ground. She didn't ask nor consider my items because she clearly threw my belongings on the ground to make room for her items. Moreover, she and I have lifestyles that heavily conflict, in ALL aspects. I know she dislikes me bothering her as much as I do. I do my best to ease that bother. It's interfering with a lot of her life as much it's interfering with mine. To adjust, I started mending my habits so it would benefit her. To gain some privacy, sleep without loud noises, and offer her privacy, I've started sleeping in another room and just wake up to go back to my room to change and use my vanity (which she set her entire computer on). It would be so much easier if we were in separate rooms, right?

I suggested to her that she'd take the empty room in the other part of our house because it not only has amenities for her she'd prefer, but we'd live so much easier. It would clearly benefit both of us. She'd only been living here two weeks and I've given her a lot of my items and effort to change my lifestyle out of respect for her. The first thing she says is for me to move... my entire closet, vanity, computer, my literal everything was in the room we share. She'd barely settled in. I wasn't quite understanding, so I asked further. She says that I'm selfish and "bitchy" for asking her to move into an empty room. I never curse or disrespect her at any time. After, I was less worried about the room situation and more concerned about why she saw me that way. I began giving her my thoughts and how she treats my concerns, disregarding them immediately without attention to my feelings, saying i'm "yapping", "throwing a tantrum", "dramatic" when i wrote respectful paragraphs just asking her to consider my perspective and give me a valid reason why she won't consider any opinions I have. She tells me to deal with it for the five months left I have at home.

Should i just suck it up and deal with it? It's just sharing a room and 'sacrificing a little privacy' for my older sister's comfort. I just don't understand. Am i throwing a tantrum? Am i the asshole?