HearHooves, I mean this sincerely and as kindly as possible. I've seen your posts on various threads but didn't realise til this one that you're shielding on your own, and honestly, I'm not surprised it's driving you round the bend. I also live alone, and even though I'm usually quite happy in my own company, the early part of lockdown was absolute hell. No-one knew how long this was going to last, and all the smug posts from people spending more time with their families, 'loving the slower pace of life', and proclaiming that we weren't allowed to complain about anything unless we were literally dying gave me the ABSOLUTE RAGE like nothing I've felt before. At times I was sincerely wishing for people to lose their jobs, homes and relationships as a result of the lockdown they were celebrating so much, so they would have cause to regret being so fucking sanctimonious about it. It's not who I am at all.
People don't understand just how much enforced total isolation fucks you up mentally unless they've experienced it for themselves - and that was after a month, with the ability to go outside, and (sort of) knowing there was going to be an end date at some point. Your situation is so much worse, with no end in sight and the potential for serious illness or death rather than simply being fined for going against the rules. In your position I don't know how or whether I would cope and, while I don't agree, I completely understand why you feel the need to lash out at people whose lives are starting to go back to normal.
I think perhaps it would do you some good to step away from MN for a bit. You are on here a lot, and unfortunately as a forum it does have a tendency to bring out the smug twattery in people (not on this thread but in general). I know it's easier said than done when forums are currently your most accessible form of social contact, but as restrictions are being lifted people will inevitably post about things they're doing that you currently can't, as is their right. You know that being angry with them won't change anything, and maybe you need to consider whether it's actually helping you. At the very least it might be a good idea to avoid threads that are obviously about people being happy that they're able to do more things. Even posting more about neutral topics would probably be better for you than getting into constant arguments about other people doing the things they're allowed to.
(Sorry for derailing OP, although to be fair I think that was done pretty effectively a while ago!)