Hi Lyndsay, When my mother would be mean to me ...at first I ended up in screaming fights with her. In time I realized that was not helping.... she was not going to change. So I needed to change.
I simply would think she is just insane, and say very little.... so, I would leave the house and take walks... or stay in my room and focus on my hobbies.... or go hang-out with a friend and "focus on something different". I did seek help for my depression at the county health clinic. It was slow but they did help me.
Oh, at age 20 I moved away... over 1,000 mile away.... Then had some more space to work on myself.... with God's help (of course).
Likely, you have been around a negative enviroment for years. We end up with a mind programed with illusion for what is normal. Its like our brain has a computer virus. It take sometime to deprogram... and see the world differently. Just remember to love yourself.... give yourself a break...
One more thing I just remembered... I have a yonger sister... I would get out her coloring books and focus on coloring a page.... this would help me tone out the crazy behavior in the other room. I hope this helps. Be well...JC