Work more then you don’t have time or energy for such thoughts.

Germany, the Netherlands, Japan are some of the most densely populated areas in the world. If you are in a very crowded place then people prefer common rules on how to behave so they don’t step on each others feet.

In vast countries like Russia and the US there to tend to be less rules, you need to improvise, define you own rules.

This historic national experience has been carried on until today and become part of the culture. It really depends on your personality in which cultures you can thrive.

You might be suffering from vitamin D deficiency which can cause depression. In winter the skin does not produce enough vitamin D if you are mostly indoors. You probably need to take some extra vitamin D pills.