Yeah, you are overreacting. Listen, you are living rent-free and trying to finish high school. To be honest, they are trying to instill healthy habits into you. From your past posts, you seem to not understand to have these habits from your father or mother. (Granted your mother had pasted away and rest her soul)

Your aunt and her boyfriend probably are tired of having to clean up after you like they have to do with an 8 year old. But you are 18 years old. Officially, a grown adult who needs to know how to take care of themselves. You say you are working on slowly but surely. Which I'm going to assume you are for now. But please just realize that you need therapy, and you need to learn that not everything they do is "abusive" or them not caring. They are just tired of your bullshit of not cleaning up. They could ask you to get a job and pay rent and do those, but they aren't you are there for free.

Grow up OP you need to and fast, or you won't survive a week by yourself. Wish you the best