Omg, therapy. Yes. Invest in yourself. You can't change your parents, but you can learn to change how you react to the situations you find yourself in.

And absolutely throwing my vote into the "get out of the house" hat. Not sure what your transportation situation or your cityscape looks like, hopefully it's manageable. A public library has a tremendous amount of resources. If you want to be alone you can book a study room, they offer programs or art shows or chat groups. And if you take a nap in a library nobody cares, at least in my experience no one has cared.

I also want to suggest the idea of volunteering. If you feel like you have time, and again transportation allows it, volunteering a couple hours a week gets you great resume fodder, connections, access to people that are perhaps healthier examples of humans, and it is definitely a mood booster.

You're in the slog. You've got a goal and you're working toward it. Keep slogging, you'll get there. And! If you need to just take a break and scroll, that's okay. Be patient with and kind to yourself. Hugs.