But what was the mental disorder you suffered from that made you seek out therapy? If you didn't suffer from one then of course it was worthless. It's like taking iodine supplements when you aren't iodine deficient.
Or, as another apt metaphor, its like taking hydration tablets instead of water.
Not that they don't help, but that you're using them wrong.
In your example, it sounds like arrogance, hubris, and dogmatic conviction could be problematic if a person cannot recognize room for growth without first identifying a character flaw to grow out of.