I'm very sorry op, I know how you feel because I was practically in your situation when I was your age, I don't think you should listen to that other person's advice personally because both of your parents are mentally fucked and that's not your shit to try and solve, you need to focus on yourself and only on yourself. In some countries like my own once you reach 16 you can leave your parents home, no questions asked, but idk what it's like where you live.

My advice would be to create as big of a support system you can outside of your home so you can start planning to move out as soon as you're legally able to or even sooner if your parents cross a line, have friends, multiple counsellors and general practitioners see you as often as possible, let teachers you trust know, look into shared housing and whatever welfare programs your country may offer and start applying for those things the second you're eligible, save up as much money as you can then when the time comes for you to leave, or if an emergency comes up you can leave prepared and whatever your parents say or react with will legally have no impact on your now free life.

If things happened to become physically violent or just too fucked up before hand tho I really want you to seek help from the authorities. Sorry if my advice isn't quite what you're looking for I'm just giving it based off of my own experiences and I understand that it varies between situations and who's experiencing it. I wish the absolute best for you and I promise life gets better beyond shitty parents. Please feel free to pm me if you need anything at all.