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Yes if everyone else had happy and perfect lives and you were just going into those happy and perfect lives unwelcomed and shouting about how miserable you are, that would be a downer. THIS IS NOT WHAT IS HAPPENING.
People follow you on Twitter because they're interested in what you have to say. That means what you are talking is resonating with them. They share some of your problems. When you are being "whiny" and "complaining nonconstructively" or whatever, you are helping.
There are certainly nonconstructive ways to complain, but alt twitter is very much an opt-in place that is relatively free of social obligations. If people find your complaints unhelpful or unpleasant they can just unfollow you! It's not a big deal!
Anyway I'm sorry to subtweet the relevant parties quite so blatantly, I love you all and think your accounts are great. 
Also yes of course it feels like everything you're saying is "obvious". That's because the things you are most equipped to explain usefully to others are the things that are obvious to you and not to them. It's literally curse of knowledge plus depression.
I am aware that the virtual equivalent of grabbing someone by the shoulders, shaking them, and shouting "YOU HAVE WORTH DAMMIT STOP SAYING YOU DON'T" is not the most delicate and considered of mental health interventions but I have *no* spoons left for subtlety this week.
How about casting doubt on whether life is worth living?
Complicated one. I'm not sure I believe suicide contagion is a real thing and I bet people who feel this way will be healthier and happier for someone to talk to who shares and understands their experiences? But ultimately I don't know - outside of my expertise.
You are one of the subtweeted accounts in question.
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