As someone who has friends before in a similar situation as you, you may have certain limitations or disabilities and the best option is, yes it’s work but it’s extremely gratifying is to go and find a good therapist that you can talk to to help understand yourself and your predicament.
That’s my suggestion of the best course as you have potentially other underlying things you don’t realize like severe codependency (from my experience from my friends I used to have, not saying you do)
If you simply just don’t do anything nothing will change and it will get worse and worse.
(Just in case your hyper dependent with your parents) Just absolutely do something if you care about yourself at all. Your parent(s) will not be there forever, they can’t sustain you forever.
As a millennial I can tell you that most millennials I know wouldn’t want this but instead make it a place for none corporation and community events and such. A public place where your not forced to buy things where can just exist with others even if you have zero money and accessible to all genders and disabilities and races.
And yes retrofit part of it for people who need to get back on there feet, and homeless people.
If we could retrofit them into homeless shelters we could but it would require rebuilding mostly everything as malls are designed for stores not housing people (for instance the bathrooms are not private and not easily accessible if you live somewhere in it)