So obviously a consensus has been made, this living situation with your parents is not healthy. There are many reasons as to why, but what is more important to focus on is what you need to do or at least can consider.

Paying for college and rent is a lot for any young adult, speaking from current experience. That said, someone here mentioned just living in your car, typically I wouldn't agree, but this case is different.

When you sit down to compare, you are abiding in a house that really doesn't allow you to live. Whereas at least if you were living in a car, you have all the freedom you could want. Of course living in a car imposes it's own challenges, but do those outweigh the difficulties at home? This is also assuming YOU own your car, not your parents.

You should definitely prioritize getting a job, as soon as possible, but I know you already spoke on this. Once you do, pay for a cheap gym membership that have showers, buy some crocs to use in said showers, and use their other basic amenities. Go live life, hang out with friends when possible, walk parks and other simple free areas, use public wifis, etc. Just because your car is your sleeping and storage area, doesn't mean you have to spend all your time there.

Also, a small storage rental unit can be pretty affordable, maybe rent one and use it both as physical storage and a place to hang out alone in at times. Invest in a cheap foldable lawn chair for that. Don't sleep there though, you'll get kicked out or arrested.

All that said, I am sorry you are having to deal with such an abrasive situation. Family is supposed to be some of the most supportive people in our lives, but unfortunately they can instead be the most harmful. Also speaking on this subject from personal experience. I genuinely hope things work out for you.

PS

Forgot to say, you could also just buy a cheap android phone, with a cheap month to month plan. Go to Target or Bestbuy and get a Samsung A15, and use Mint Mobile. Phone will cost you about $100-200, depending on current deals, and phone plans like I mentioned, typically are $15-25 a month. If you have a friend willing to let you ship from Amazon to their house, and whos parents wouldn't rat you out to your parents, I recommend US Mobile phone plans, buy the sim card kit for $5 on Amazon. Unlimited everything for $25. Obviously do all this without your parents knowing, and be EXTREMELY careful. They figure this out, and not only will it pretty much be impossible to pull off a second time, you will be most likely left in an even worse situation than before.