by many people, including myself (when I was younger).
The idea is that the place you live in "makes" you either happyor unhappy. If the place is cool, fun and exciting you will be too. If the place is slow and boring you are required to be miserable.
As one who used to sing this song, all I can say is "sing along," but the words will get old. When you decide you are responsible for your own happiness- good news- you can probably change it.
As a good friend told me, at the time:
They took the barbed wire down, you can leave. Feel free to live where you like.