Aw bless you aleC4.
I do understand how you feel, especially this time of year.
It is still relatively early for you, and generally you're doing very well.
I too still feel a pang when I see couples together, I felt it yesterday in the supermarket of all places. A lady about my age was being helped to unload the shopping into the car next to mine by her partner, and he said 'let me do that love, you get in the car, I'll take the trolley back." And I was struggling to get my stuff in the boot, and yes it hit me again that I do stuff alone and it is bloody hard. I'll spend half term sorting the house out, lots of gardening and chores, mostly on my own.
But it's better aleC4. It's preferable to the alternative of being in a marriage with someone who doesn't want you. I get the odd hour here and there (like now, on my tablet in the conservatory which is furnished entirely to my taste with a coffee in my favourite mug) and really enjoy being on my own. I savour it, being single. I am my own person, I please myself, there are no eggshells to walk on, no ego to boost or massage.
And like a pp said above, those couples in the pub garden, or those couples having a bbq could be as miserable as sin. It's easy to look back through rose tinted specs and think 'Oh we would have been having a bbq, and sharing a drink and putting the world to rights', and feel a pang. But follow that through...when I do I remember us in the garden, bottle of wine and him constantly checking his phone...or him throwing one bag of groceries in the back of the car, leaving me with the rest. Or me suggesting a family bbq and doing all the work whilst he went along with it under sufferance.
God I've rambled! Sorry. I do all the things either alone or with friends. It's different, it can be sad, but it's fine. I have other interests that I would never have considered if my life hadn't been forced down this path, and that aspect is great.
My dear departed Irish grandmama used to say, "It's better to be on the shelf than smashed and broken on the floor Cary, so it is..."
She was a wise lady, so she was!
Have a good day sweetie, see this stage as a transition. You'll meet someone worthy of you when the time is right.