Those are some really good points. Particularly about socialization, and I agree with you.
Having said that, personally I don't think much about happiness or "stuff". I think physiologically I'm just predisposed to happiness already. Past that, challenges and achievement make me happy-er.
I see all these posts about anxiety or depression on Steemit and it just goes over my head.
Similarly there are people in my personal life; family and co-workers that have all these problems, and I can't help but think some of them just came out that way.
There is probably something to what you are saying here. I've never even remotely been depressed, no matter how much shit I had to deal with. Just a shrug of the shoulders and a "let's get on with it" type attitude.