Depression isn't caused by chemical imbalances or whatever other causes outside of ones responsibility. It's caused by ones life. The people one shares his life with, the environment, ones approach towards life itself. When you suffer from depression, you suffer from your existence. Either because it is shit, or because you make it shit and don't know better.
It's amazing how far we've come with ignoring that there are a lot of things well within our control when it comes to mental health, as long as we stop pretending they're not.
I'm not saying that everyone has the chance to change his life. I'm saying that there's too much of a lack of self responsibility in favour of dependence on "luck" and "external factors" which "require" medication, because "there's nothing you can do."
I'm not blaming anyone but myself for my state and I certainly don't try to pretend that it's outside of my control. It isn't. I know that, because I can manage it all by myself, without depending on anything. It doesn't change my life and I'm still working on that, but if i blamed some random ass excuse of a chemical imbalance for something that's actually my own fucking fault, then I'll just stay like this forever.