<human>: Give me the gist of the text in a nutshell

My potential roommate (21f) is totally awesome. We are good friends and I think we would be pretty good roommates. Only problem is, there are some things I see her do involving material objects I wouldn't be cool with. There are things I wouldn't mind her using of course. Like my tv and treadmill and any food I plan on putting in a community area for us to use. I am a very sharing person when it comes to most things. But she goes into her current roommates room (21f) and just always borrows clothes and shoes and doesn't think anything of it. I am short and curvy so nice, well fitting clothes are hard to come by and a nice luxury. I wouldn't want to lose them to stains or the depths of her closet. I wouldn't want her borrowing them. Also, my only really nice possession is my stereo. Its not very expensive , but expensive enough I couldn't easily replace it. She has cheap speakers in her living room that are only a few months old and already crackle and pop from abuse from her brother. I know that she would love my stereo, but I wouldn't want her destroying it...would you be offended if I told you not to use my clothes or stereo? Will I come across as uptight?

I'm painting her as selfish but she's not. She's selfless. She comes from a family where they share everything and are very caring and communal. I just am not that way. And while I think she would be careful with my stuff, I don't trust her brother (23m) to value things as much as she does. They are very close. At least once a week they have a late night conversation with drinks and he crashes on their couch. He's a nice guy, just has no respect for peoples things. He's the one responsible for the blown out speakers in the living room. And there is no way for me to say you can use my stereo, but your older brother can't. They're kind of a package deal...
<bot>: is it wrong of me (20f) to tell my potential roommate (21f) not to use my stereo and clothes if we were to live together?