Sorry OP I haven’t read the whole thread, are you online dating? What sites are you using?
There’s a dating thread where there’s loads of us in a similar situation and you will find what ever shape and size we are we all find it hard to find anyone. I have been dating for 3 years and I’m still single, I get lonely at times but also enjoy being single (I miss waking up next to someone and having someone to tell how my day has been but I also like doing my own thing). I have been on quite a few dates and have got nowhere. I am a size 10/12, I go to the gym so I’m reasonably fit, plenty of older men message me but usually they are just after one thing, when I do meet someone I like they usually end up ghoasting me.
I’m not sure if I’m datable, I’m not sure if men find me intimidating because I’m very independent and have lots of hobbies? I don’t know if I’m ugly (I don’t think I am but men might see me differently) or maybe the fact I have kids puts them off.
On line dating has made people more fussy because they have more choice infront of them, it’s a bit like shopping for a new coat that has to be a perfect fit. Some men to prefer slim laddies, probably because they watch too much porn where the women are young and perfect, they don’t seem to notice that them themselves are overweight, ugly and showing signs of age 
If you feel your weight is a problems maybe join some fitness classes, you never know, you might meet someone there whilst trying to loose weight, I don’t think joining a slimming group will cure you loneliness as they are pretty depressing (I went to SW and it was awful).
Get some hobbies that involve getting out and about, join ‘meet me’ and maybe join some walking groups. I have taken up photograpghy and walking, it’s something I can do on my own but I often meet others when I’m out and about.