Op, the things we've got from you is that you're lonely and that an accumulation of things over the years have got you to where you are now (which you're certainly not happy with). You can't just change life, but now you've acknowledged this it's time to work at improving/changing things. Obviously you can't just change everything, I know, but things that can help no matter how small.
Not for everyone, but speaking to your doctor or some counselling can go a long way (my DH does this, and he says it's brilliant how many people have got themselves to a different more settled place).
You mention you're lonely, do you have the money to try different clubs - it might be hard to start with so try a few times. It's important to get yourself out every day if you can, whether to the shops, go for a coffee, plan local walks and even a day trip to your nearest town.
You'll get a mix of replies to anything on here but an awful lot of people are on here to support, just chat to, whether about your post or things in general like tv, book, something funny they've seen etc.