AIO my Dads girlfriend threw my old things in my old room in the middle of ny new room

Hello, I am 18 year old (f) and currently my dads gf of about 3 months is moving in with us (I know talk about fast). But that’s besides the point currently they are all moving in, I was forced to move out of my room I believe early Junish, in which a lot of stuff from the guest room has moved in to my old room in addition I left some stuff in my old room because her younger is moving in sometime late July early August, so I thought it was ok just to leave some belongings as I settle in to my new space. Admittedly it has been about a month maybe a little less sense I moved in so I should have probably found a place but I have been busy with work, friends who are only here for limited periods plus a vacation we went on with her family. Suffice to say I’ve been extremely stressed and haven’t been to achieve the progress on moving that I wanted. But they just started their moving process yesterday and I come in today after an honestly long day at work to see all the stuff i didn’t have space for thrown into the middle of my room. I was not happy in the slightest about this revelation especially when I said I want to lay down and she said “go for it!”, so want really erked me is nobody even tried to talk to me about the stuff that moved, especially the tank I use to feed my friends snake, I barely have room for the snake in my room and straight up have no room for the feeding the tank. So now I am currently cleaning up everything and finding things that aren’t even mine and I’m frankly livid nobody texted me or anything and I know if I speak out and say “a text or anything communication would have been nice” I’ll just get told “you had time, this is on you, you shouldn’t be upset, etc” I’m just so frustrated I dont even want to have dinner with them. I fear I’m overreacting to such an inconvenience it just feels so disrespectful me but again maybe I’m overreacting because of just everything else going on in my life.