>>23020
I can imagine alot of reasons /jp/sies would be depressed. Depression isnt usually being sad because theres some state of affairs or event that should logically make you sad.
Various reasons that could cause these things on their own, or in any combination with each other:
Loneliness
Mental illness(autism, natural predisposition to depression, etc)
Abuse by parents, either in the past or ongoing
Abuse by peers, either in the past or ongoing
Taking it too easy(ie, not using endless free time as NEET to do things that are actually engaging and enjoyable, or not using it for that enough)
Not eating enough
Excessive masturbation
Maintenance of a bitter and unfriendly attitude(may be selective about towards what sorta people its directed)
And probably more, plenty more