In popular Western culture we are taught that the way to achieve happiness is to change our external environment to fit our wishes. But this strategy doesn’t work. In every life, pleasure and pain, gain and loss, praise and blame keep showing up, no matter how hard we struggle to have only pleasure, gain, and praise. Buddhist psychology offers a different approach to happiness, teaching that states of consciousness are far more crucial than outer circumstances.

More than anything else, the way we experience life is created by the particular states of mind with which we meet it.
Of course there's more but you knew that.

Understanding Your Own Mind — by Jack Kornfield

https://jackkornfield.com/why-we-worry/