Why do I always want to have my things separated from other people's stuff?

echoflowerrr
Right now, I'm sharing a room with my sister. We have a nightstand where I have two of the drawers and she has two, and then we both have some of my things, like figured and everything, on one half, and she has hers on her half. I genuinely can't stand it when she puts anything of hers on top of a book I have on the nightstand. We also have this plastic box that was bought for us both to share to put our books in since I was keeping all of mine on top of the nightstand. My little sister has some books but she's never actually read them, since she's more of a person who likes to watch shows and everything instead. I have maybe a little over 10 books, those ones being the ones I couldn't fit in the bigger drawer in the nightstand, and I've finished most of them but I'm still reading some. For some reason I hate having our things in the same spot, so obviously I don't like having our books in the same box. Kind of because I'm worried about the books I have that aren't hardcover getting bent, but I also just don't like the fact that our books are in the same place. Basically I don't like my things being in the same place as hers at all. I don't know if I feel the same with other people since I haven't shared a room with anyone but her, other than when I was younger which was me and her sharing a room, plus our other sister, but at the time I was still way younger so it didn't bother me having my stuff mixed up with theirs. I'm not sure what it is that bothers and kinda annoys me so much about having my things with my sisters, and I feel like it's probably just me being dramatic.
Why do I always want to have my things separated from other people's stuff?
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