Try and look at the positives, You have a roof over your head, you can eat everyday and you go to work and go home, you possibly have also people you can talk to in work, maybe even made some good friends there too.
You'll only annoy yourself if you see other families that don't work that have numerous kids going about their day without a care in the world...Would you like that lifestyle also, just sitting in the house all day living off benefits? Me personally, Absolutely not.
Maybe being on your own is a massive problem more so than what other people are doing and not earning as much as you'd like? Do you have any hobbies or anything?
I used to think the exact same as you and it does sometimes cross my mind to this day, but those people don't effect my life so I just leave them to it, I wouldn't like to be in there shoes, My kids seen me going to work everyday, bringing money in to keep us all going sets a good example in my eyes, I never went to college but I want my kids going to college so they don't have to be in a position that I'm in which is working 8-5 everyday carrying heavy shit, I want them to do as less work as possible for a big pay packet every week.
I don't know exactly as I've only read your two posts, but if it is a case of living alone maybe you've too much time to think? Get yourself out and about running or even walking, I find it really enjoyable.