"We all have our difficulties, they are just different and what seems easier to you might not be easier for me."
This, you're allowed to feel like your situation is crap, but everyone's is. Just because you perceive theirs to be easier doesn't mean it is. We all have it crap.
"What I would give to have had a few months to myself in a lockdown to read/ watch boxsets!"
This isn't the life of everyone child free in lockdown. I'm child free but working 12 hour days to pick up the slack of parents working from home with kids who inevitably can't be as productive. I love kids and would much rather be doing 4 hours work a day and spend the rest looking after young kids (in normal time I babysit a lot for nieces and nephews). Where I'm sitting parents have it much nicer because they're with people they love, whether I'm spending 12 hours a day sat alone on my bed in my shitty house share doing work. I hate every person with children who goes “no one without children could POSSIBLY have it as hard as I do, you can't even comprehend how hard my life is right now."
Because I am childless I live for my friends and social life, now this has been taken away I am literally just existing, I don't really have anything to live for. Whether from where I'm sitting you have your kids to live for. And I can't even have zoom parties with them because I'm working 12 hour days.
But I can still recognise that you're having a hard time and I sympathise with that. We're all having a hard time, lockdown is crap for almost everyone.
I'm not gonna tell you to be thankful for what you do have because people who say that to me infuriate me, I and you are both allowed to be angry about our crap situations. But do recognise that everyone has crap situations, not just you, very few people have it easier right now, we just have different kinds of hard.