The entire point of clinical depression is that it's not environmental, it's intrinsic. Yes, this means it won't change - that's why antidepressants exist. It's why you should see a therapist for it, and should stop listening to people implying you can just eat different or whatever. This knowledge sucks, but you trying to keep that a secret and shaming someone into silence isn't helping.
> The entire point of clinical depression is that it's not environmental, it's intrinsic. Yes, this means it won't change
Wrong. I lost at least a decade of really great years to this belief. It's bullshit. I've made huge strides in my "clinical" depression despite my environment not markedly improving. I did, however, improve myself enough to recognize and stop maladaptive behaviors.
It's hard as hell to change yourself, but you're not immutable.