Took me so long

I just realized my mom is honestly emotionally abusive. She insults me all the time for not wanting to take care of 4 kids, she's always threatening to hit me if I try to tell her I need a break. She took me out of public school to 'home school' me, but really she only got me a phone with a learning app on it, I can't do any math past 5th grade and even then I can't divide unless it's simple and only whole numbers. She makes me do all the cleaning for a 7 person household, she constantly breaks promises, I'm 14 and I'm just now getting my own room, I don't even have a door. I'm not allowed to pick my own clothes, I'm not allowed to have friends, I'm not even allowed to have any social media besides YouTube, she'd kill me if she knew I was doing this. She calls me lazy all the time but she won't let me get a job, she always shames me for my interests, and she complains about my screen time but she won't let me go outside, she never wants to take us anywhere, she won't even let my siblings and I walk 5 minutes down the street to the park, but she'll always send us down the street if she wants something from the store. I have major social anxiety because I've been isolated for 4 years, I worked up the courage to contact the police once, and I had to do that through a panic attack. Our DFAC case worker hasn't been here since November of last year even after she promised to visit every month, she's been to our house 4 times so far and has only talked to us once, she even warns my mom every time before she comes over like that doesn't defeat the point of coming. I think I'm autistic, my mom refuses to let me get assessed and she calls me special Ed and retarded all the time, I can't work up the courage to ask for help again.