Why are so many Japanese people not happy?

Question:

In most surveys, polls and studies they reveal that Japanese people actually score quite low in terms of how happy or satisfied they are. Even compared to many poor countries Japanese people show a lot higher rates of depression, unhappiness, etc.

Why is this? What has created so many Japanese people to be so unhappy with their lives?

Are there things like lack of social interaction that contributes to this? Or a bad welfare system? Or is the only thing people care about just working at their job or studying?

Answer:

Imagine;
- you're raised to control/suppress your feelings
- the society focuses on "precision" "punctuality"
- there're a lot of competitions, (e.g. entering university)
- you live in lots of ties of (unnecessary) obligation

Welfare system is quite functional in Japan.
Japanese people basically don't like refusing/complaining things --> overwork/ suppress --> exhausted