Am I wrong for being pissed at her?

[Anonymous]

I sometimes leave my car at home and I gave my mom the key so she could use it from time to time. Yesterday I forgot my wallet and a few other things in my car and left it at home. When I returned my sister told me she had gone through all my things including my wallet and console. I really hate when she does stuff like this. She's always eavesdropping on my conversations and thinks I should have no ''secrets'' from her because we're a family and tell each other ''everything''. It really annoys me because sometimes I just want to have a private conversation with my friends and be free to talk about how I feel without her input. Yesterday one of my siblings washed my car after I told him not to because it's never done well and he leaves streaks of dirt and grime in places that there wasn't any to begin with.
When I called her to tell her not to let him she told me I was overreacting and needed to calm down and be grateful. Of course when I got home my car was absolutely filthy after I had just gotten it washed three days prior to this. I was very upset and went to my room. Where she of course came in without knocking to act like nothing was wrong. When I just said I was going to g to bed because I was upset she told me I needed to grow up and stop getting upset before she slaps me. I was livid. I mean here I am letting her use my car when she uses up all the gas and never refills it to go out and do whatever and my only request that the car not be washed was totally disregarded.
I want to just take my keys back and tell her never to touch it again. She seems to think she can just say and do whatever she wants and it annoys me. I pay for all the services that car gets. She never gives me a dime I feel that she could at least be respectful of my wishes and follow one simple request.

[Emily_925]

Omg what a bitch, no offense but she sounds awful. You should move out, and definitely do not let her use your car! Sounds like she is just using you and your car and thinks she's better than you which obviously she is not cause she's an ass

[Asker]

she always tells me i can't move out and im beginning to see this is a toxic relationship

[Emily_925]

Oh well just move out anyway. If ur old enough, then get a job u know. I moved out when I turned 18 cause I just couldn't get a long with my mum, however now that we have distance we actually get along way better. I think after all the years if living together space really will help you even if she says no

[Asker]

I have a job as well