Why is this recognized as a legitimate science instead of the quackery it clearly is?

>I feel like shit because my life is shit
Depression
>sometimes I feel angry and sometimes I feel sad
Bipolar disorder
>my kid can't pay attention in class and stay seated for 8 hours straight
ADHD
>I'm a piece of shit
BPD

And whatever legitimate roles psychiatry can have can be relegated to neurology or philosophy.