I definitely agree with this point of view, that your happiness is not necessarily a consequence of your environment but something you can actively shape yourself. Some people are trapped in circumstances, or at least feel that way, like someone supporting an elderly relative through their end of life - which can be very challenging and restrictive. However there are other people who sometimes waste a lot of their free time or do not utilize it, yet complain they don't have enough money to do things. There are often many opportunities around us or possible with a little bit of experimenting, yet some would rather play video games or sit in front of a TV like a potato. The most successful and happy people who I've ever met are definitely proactive instead of neutral or reactive.