Sorry, OP, I can't read the whole thread right now but I wanted to say hello.
I am also incredibly lonely. It started because my friends growing up were much more dynamic than I was so left university and did exciting things all over the country/world. I went back to my parents'.
I have always had absolutely zero self esteem and no confidence at all. So I have drifted in not very exciting jobs and accepted relationships with truly horrible and dangerous (at times) men.
I got divorced nearly 20 years ago and had my children 99.9% of the time. My ex hasn't seen one of my children AT ALL for 7 years. Both children are adults now and one has moved out, which is great but less chatting and things to do for me.
One of my children has autism so I am incredibly limited in where I can go and for how long. He left education 2 years ago and I am lucky if I can get him to leave the house once a week. That said, I can now pop out myself for a few hours at a time.
Sometimes it all feels dreadful.
HOWEVER... after the last short relationship ended (mid July) he was such a complete and utter bastard that I knew things had to change.
I now have a job with 3 shifts totalling 12 hours a week. One is before my son is even awake! He's been OK for the later shifts too.
I started walking 4 miles (nearly) every day and have lost 1.5 stones. I have another 1.5 stones to go.
I've been trying not to think about the loneliness and just enjoy each tiny thing that has a bit of happiness in it - getting excited about what I will watch on TV each evening, cooking something new, cooking lots of stuff then freezing it.
Things are better but it is still very difficult and so exhausting.