How to tell my mom she's pushing everyone away?

Anonymous
No one likes being around my mom because she is extremley negative and controlling. (my brother moved away and won't talk to her) I usually just walk away or go to my room etc. But I feel like I should be there for her, because no one else is. But she is extremley passive about what it is she wants. I'll give an example of last night.. We were watching a movie that she went out and bought because I recommended it, she didn't like the movie and started getting angry at me for having her buy it. When she left the room I put on a movie we would both like, but started the 3D version, when she got back she started to complain about it being in 3D and I told I was just testing it out. She then said "Fine I'll go on your computer!" and ran to my room. (Her computer is broken) I honestly don't mind her using my computer (which I paid for myself with money from my job) but I can't stand how she acts like a child. I didn't let her use my computer and instead I just went to my room, (with out slamming the door), I know that doesn't help, that is passive agressive as well.. I try so hard to be calm and understanding, I even try spending quality time with her like cooking together or long talks or give attention to her collections (she's a bit of a "hoarder") I'll say things like "ooo what's that?" "where'd you get it?" she could spend hours talking about her collections(fossils, jewlery, stones, figurines, antiques, etc.) I don't think her problems are with me but with her relationship with my dad and things from her past. I love my mom but how do I deal with her not saying what she wants? Leave? tell her its not OK to do that? Sometimes I think I'll leave but never come back, that example I gave was extremley minor.. there's times where she's attacked me, or destroyed my property. I refuse to get police involved, I am an adult (18) so I can leave.. forever... But I rather work it out because I can't afford to move out and I do love her. How do I tell her and in a way that she can't agrue back? Or say "If you don't like it move out!". I just want peace in the house, That shouldn't be asking for too much.
How to tell my mom she's pushing everyone away?
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