I think you might have gone into this with a misunderstanding of who Sylvia Plath was.

You’re reading the journals of a woman with depression who eventually committed suicide. She isn’t ungrateful and lacking in foresight - she’s lacking in serotonin, dopamine and norepinephrine because depression is caused by a chemical imbalance in the brain.

What you’ve discovered is that depression sucks. That you can have caviar and champagne and all kinds of fun and you still feel horrific.