Is this a good idea?

Long story short, my intermittently abusive mom is being really abusive again but I’m 18 so I can leave without the cops dragging me back. Only issue is I don’t have anyone to go to. I’ve never had a support system, especially not one I can rely on in times of need, but I’m scared to go to a shelter or something. I can’t find housing on such short notice so it’s pretty much my only option. I’m scared that I’ll be treated badly because I left a home for a homeless shelter, or my stuff will get ransacked and stolen(whether I leave it here or take it with me). Maybe I should just come clean about everything to my therapist and get stuck in a psyche ward. Hell, maybe my mom might get arrested to boot.