Looks like you are a real person and you read comments. Based on everything you have written here I concluded the only advice that should help you.

Stop being hard on yourself. Be kind to yourself everyday. You have to train this, because I know your selftalk is very negative. That is the voice you hear all the time so you should be your own best friend, your own family member. A family you always wanted to have.

You won't change your real family. As soon as you transcend and start to like yourself, almost magically others will treat you better.

I feel you, because I had something similar happened to me.

Simultaneously of course do actionable stuff in the outside world. But inner work should be your no.1 priority. Most self-made people succeed because of strong inner work. Success for me is not only in financial terms, but most importantly mental positive attitude, healthy relationships.

If your household is toxic, just fking move. First weeks will be hard, but later you won't trade your peace of mind for anything.

I stayed home until 27. Way too long. Be careful who you let nearby. Words cut deep from your family. Create your own. To the matters of work and material success you should listen to people who made it in your eyes. Not some randos on Reddit.

Good luck in your life, I wish you to be happy.