I definitely think and feel that you are not alone in feeling like this OP,
Which is kind of ironic given that you feel so lonely in that place.
I listen to talk radio Radio 4 and at present can't bear listening to inspiring stories about people who have overcome difficulties adn then gone on to be hugely successful.
It just makes me depressed as it seems so out of reach at the moment.
I liked what one poster said about fully accepting where you are, and then it changes shape and becomes something different.
There is also something about acquiring the skills to deal with loneliness. I have noticed some people go round in tribes with their family, kids etc and never do anything on their own. Which is the opposite extreme.
And maybe they are the ones who are vulnerable. If anything happens to their supposedly solid existence, I do wonder what they would do.
You hear enought stories about people losing their partners and not knowing how to pay bills (because Georgia/George always dealt with it).
As hard as it sometimes is being a single parent the bits I'm most proud of are learning to do new things on my own, because I haveto/or choose to/or can't afford to smoeone in.
I've had relationships where I've leant on a man and thought it was cooperative and two sided, and he has helped with DIY etc, but then come back with a lot of resentment on his part and I wished I had done it all myself anyway as I didn't need to grief.