I think there are two major things in life: a. What you do because you have to (you need to eat, thus you need money, thus you need to work, thus you need to have a job, thus you need to act in certain ways); b. What you do just because you want to (decide to go out for a run, play a game); OK, the above is not rocket science, but it’s pretty important on how decisive are the above things on emotions; only do things because you’re forced to, and you may not feel good; managing to do the things you love & have to do at the same time, you may feel better; Also, diversity is key – you can’t eat chocolate all day and expect to feel great after this; A final observation – the above are very likely seen in movies – you may notice what is a job and what is a pleasure; also, people seem to get a lot pleasure from childhood.