How can I determine whether dissatisfaction is inherent to being human or a symptom(/result) of my culture ?

Answer 1

By asking :)
Yes, it is inherent, but not necessary.
Dissatisfaction could be good for evolution - we have inbuilt systems that may cause dissatisfaction, to some extent there are workarounds.
Culture can exacerbate dissatisfaction, overachievers are usually dysfunctional.
Mono-amine oxidase prevents potentially harmful chemicals from crossing the brain blood barrier - this includes chemicals that might make one satisfied.
The prefrontal cortex (the most recently developed part of our brain) differentiates among conflicting thoughts, determines good and bad, better and best, same and different, future consequences of current activities, working toward a defined goal, prediction of outcomes, expectation based on actions, and social "control".

Answer 2

By studying other cultures, especially those very different from our own. Check out non-North American or European countries and tribal societies. I don't know if you're talking about dissatisfaction as an emotion, which is universal, or a generalized feeling of dissatisfaction about, I don't know, your life or your position or whatever, which may be part of our culture.

Answer 3

It's cultural. If it were not, the buddist monks would be dissatisfied with everything (unless you do not consider them to be human beings). In fact, different cultures raise dissatisfaction to different levels.

Answer 4

You pick it up from the advertisers who tell you you need their products.