I think it's sad that people do not socialize with their neighbors more. I am guilty of not reaching out as much as I should. When my H and I do speak to our neighbors when they are working in their yards while we do our daily walk, many of them are so enjoyable to visit with. I need to do more outreach than this. If everyone would then there would be less people so alone and afraid like you are. When I was a child, I would hang out at older people's homes playing cards, watching all the interesting activities they did, eating snacks, etc. I consider one couple I hung out with my grandparents.
I am sorry you are so isolated. I have to have people to talk to or I do get very depressed. Do you like the Superbowl? Are you well enough to just go to a sport's bar to watch it in order to be part of a crowd enjoying the game? For me, that would be better than staying at home alone.