It's kinda intriguing how reliant we are on our enviroment. Stayed off caffeine for 2 days and I was depressed, numb and unmotivated the entire time. Then when I get an energy drink I suddenly am happy, motivated and full of life energy. This is relationship is purely chemical, but if you look at it from the big picture we are just a subject that recieves things from the world and releases some things back to the world. You probably aren't aware over everything you are reliant on.
You also have to consider how good and bad compound over years.
It's funny to me seeing carefree people, because they don't know how many tiny fragile things hold them up that could at any point crumble due to an unforseen event.
People like to think they can control their destiny, to some extent that is true, but at the end of the day you are just a tiny particle in a big wavy ocean.
How much you are you even? Are your decisions even your own? Your biases, your values, your worldview, it's all instilled by the culture you grew up in and even if you are counter to that culture, you didn't do it on your own you were influenced by another culture. 99 % of people will never be unique they will just be water molecules following the current. In that way it makes the idea of roles and achievment completely meaningless. Just statistics and probability. All of your achievments and misfortunes were just the result of you being a small part of something bigger that you were unaware of.