I don't quite know what to say, but it's obvious you are stressed and need someone to talk to. Firstly, it's easier said than done, but ignore the rude people on this website; there are too many to get upset over. It honestly sucks that you felt you had to delete everything on your old account, but anonymity gives people the courage to be terrible online, don't let it effect you though, you're better than them. I'm sure you don't need me to say this, but people are cruel and it sucks, but that's why you just need to push through it.
My advice is for you to slowly get yourself out of the house. Whether that's going to the library for even 30 minutes. Or doing some grocery shopping for your parents. Maybe go to a movie alone. I have not ever been in an abusive relationship, and I'm so sorry that you had to go through that. However, I have had severe anxiety and how I slowly got better was by doing things on my own bit by bit. I'd take long walks or bus rides downtown and stay in the library for hours. I'd watch movies on my own, at first I'd be nervous and afraid of being judged and a million other things, but I soon realized that no one was thinking negatively about me, we're all just minding our own business.
I think the more you get out of the house, the more comfortable you'll be in your own company. Maybe you could volunteer once a week as well for an hour or two. Baby steps is what you need in order to gain your independence.
You need to take care of yourself first and everything else will follow.
Make goals/plans for the future. They could be anything, big or small. Do you have your Driver's License? Maybe you could get it, and have your parents teach you how to drive. Do you have a job? maybe you could find a parttime job in the meantime to keep you occupied and get you out of the house and making a bit of cash. Do you like to go to the park or beach? The weather is beautiful, you could go down and have a nice picnic, maybe bring a book, or go with your parents, that's fine too.
Do things that will make you feel productive which in turn will make you happier. Keep yourself busy and occupied so that you don't feel like a day is waste, but it's a day towards a goal.
Maybe learn how to knit or cook at home or bake or take online courses, there's a bunch of free ones out there.
You could treat yourself, get a haircut, get a manicure even if you've never had one in your life, buy a nice pair of cute shoes. Put some nice clothes on and take some cute selfies. Do whatever you can to make you feel good about yourself. I'm sorry that I can't offer much else in terms of advice, but these are just things that I've done to help with my self esteem and anxiety and I'm just hope you read something here that maybe applies to you. I wish you the best and I hope you know that you are worth a lot. Don't let anyone make you feel shitty about yourself, it just reflects their bad character as a human being. Take Care OP.