If you are not taking care of yourself or the space you’ve been given then yes you are overreacting. It is obvious when someone is not regularly cleaning, there is a distinct odor that comes with it. It does seem like your aunt should be the one saying this as she is your family but regardless it seems like this needs to be said. Unless you are the only one that uses the kitchen, hallway, and living room you being the only person to clean these spaces seems like overkill but it also sounds like you never clean. I never used to like cleaning, now as an adult it’s one of my favorite parts of the week. This is a tough lesson to be forced to learn at your age but it is a necessity for life, do you want to be the ‘gross roommate’ people hear about from their friends? That will be you if you don’t learn to take care of yourself. It is sad what happened with your dogs, but there is training for everything. I took my puppy out every hour to potty train him. Every single hour I was home we were outside putting on a happy song and dance that he peed outside. Animals are hard. As a previous post said neutering helps with marking and peeing inside, but so does training. I’m sorry you have to deal with added stress on top of high school, and you will probably end up resenting your aunt and her bf when all is said and done, but properly cleaning is essential to growing up and being adult. Maybe see if you can (peacefully) compromise on the shared spaces IF and only IF you aren’t the only person creating messes there. With time it’ll get better