My sister doesn’t care about personal stuff?

I found it very annoying when my sister uses my personal stuff m, like recently i found out that she uses my bath loofah, i went to the shower after her and i found my loofah all wet so i asked her and she simply answered “i use it” i was so confused because she’s so okay with it. So i started noticing and i found out that she uses my shaving razor, and a tool that i was my face with. And when i got angry at her she was so cold with it and told its not a big deal you can simply wash them after me.
And right now i found out that she wears my bras and I’m SO WORRIED that maybe she wears my panties too.
I love her so much she's my big sister and probably she bought me half of my stuff, but they’re personal items. Like i can't stand it, its bot like she can’t buy it to her self sho has everything. But my stuff are always in the bathroom so its easier for her to grab.
I really don’t know what to do.
My sister doesn’t care about personal stuff?
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