> "and you can't change society, so you're stuck like this"
I think OP meant that psychologists/psychiatrists don't recognize the social nature of mental illness at all. Just because you can't change society doesn't mean you should tell patients that they can lift themselves out of depression through sheer willpower, healthy eating habits, and exercise. Those things can help but if you don't know how you're going to pay rent next month and you've got two kids, you're going to have serious anxiety.
Being anxious about a freight train heading straight towards you is not "anxiety" any more than grieving for the loss of a loved one is "depression." Medical doctors have absolutely nothing to do with the natural and accurate negative feelings associated with not being able to make rent.
But in most cases depression is a natural response to the difficulties of life. It's like when your immune system triggers an inflammatory response to infection. It's painful but natural; and the cause is external. Willpower can't cure depression any more than it can reduce inflammation. But in the case of mental illness, the external agent is socioeconomic hardship, family dysfunction, loss of a loved one, etc.
I think OP meant that psychologists/psychiatrists don't recognize the social nature of mental illness at all. Just because you can't change society doesn't mean you should tell patients that they can lift themselves out of depression through sheer willpower, healthy eating habits, and exercise. Those things can help but if you don't know how you're going to pay rent next month and you've got two kids, you're going to have serious anxiety.