Here's the thing, I recently had to deal with low level depression. The kind that's just minor enough to not make you want to kill yourself, but the kind that also makes everything in life unsatisfying to do at a basic level, even fun things.
I love that you've said this to me, because the truth is I have had severe depression and anxiety problems ever since I was a teenager. I can relate a lot to everything you just said; in fact it was once even the fun things started becoming a chore did I decide to seek help. It has held me back more than I care to think about, and no I can't boast a good career and yes I do still live with my father. My bank balance is genuinely £0.00 and it will be for the next week. In many ways I have achieved nothing and am a total loser. I drink and do drugs more than I really should. I haven't bought new clothes in a long time.
But the difference between us and them is that if they aren't teenagers then they're probably all of that and much more. Despite my professional failings I have a great social life with many good friends around me, I enjoy playing instruments and making different kinds of music, I have had paintings in an exhibition, every other friday I like to have someone round for an evening of sex and cuddles. They don't have any of that, most of them probably don't have any hobbies outside of video games which don't give you that feeling of achievement like a lot of other things. A lot of them probably don't have a very good social life because they don't like being around people and have poor social skills, a lot of them are constantly sexually frustrated. Many probably have family issues and other issues in their life.
Some of them will just be bad people, but even then, what is there to feel for them? Anger isn't worth it, jealousy not likely, fear hardly because they're text on a screen, all that's left is pity for me.
My anxiety used to be set off by this stuff for a long time, but eventually it stopped having an affect. I just feel sad for them now, and one day you will too. They stop causing damage when you pull the curtain and see who the Wizard of Oz really is