I believe there is no single reason that we are what we are.
You're born with certain genetics that can shape your personality and life, and the environment you're born into, and the people you are surrounded with, the institutions, they all affect our lives and personalitys as well, and this goes onto to hsape our decisions and the wya we behave, and this leads onto blah blah blah blah. You get the point yes?
In the case of mental health, I like the theory of a diathesis stressm model, basically we're born with a certain level of genetic disposition to develop diferent kinds of mental illness. If you picture it as a jar, that when you're born is filled up a certain amount of disposition to mental illness due to genetics, as we go for life, our experiences, etc. can either add to that jar, or take away from it, e.g. someone who say is bullied at school, may find that their jar fills up more than others, whereas someone who is popular and not bullied, their jar empties.
Anywho, if the jar ends up overflowing, you will develop mental illness.
I'm not sure whether I've explained that well enough, but basically it's a combination of genetics and environmental factors that can lead to mental illness, if you're born with a jar thats already pretty filled genetically, you're more susceptible to mental illness, but may not develop it with good quality of life, etc.
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