Maybe tw? How do you deal with this type of mom

She doesn't care much for me, I know that. My brothers the favorite, he's allowed to be disrespectful to everyone, hit people, etc. He has a skin condition on his head where half of his scalp would be covered in dandruff and my mom treats it like its a disability. I have sent my mom emails in the past regarding my mental health and shit and she just ignores it saying that its 'normal behavior for kids my age' even though its not. Shes also very transphobic and mean in general to me.

I can't take this anymore, so I'm asking for help of how I should deal with it untill I can legally move out