Sometimes, even a short chat with a stranger, like a nurse or someone at the bus stop, can make a big difference, like you said.
For years, old people go to stores just to talk to the cashier, because they have no one else to talk to. Humans need connection.
Have you had experience with being mocked and shamed? I know I have. However, perhaps I have mocked and shamed others too - though, I tend not to do that.
Yes, most of the time, when you share your challenges with people at first, they will sympathize with you, but later, they will be one of those who will use your problem to mock you or use it against you especially when you confide in them on something personal like health, marriage and even life generally. I have been there, so i know.
One of the problems with trusting people these days, is that they have a desire to score meaningless points against everyone else. Few can actually be trusted.