In my own case, certain things in my life were just not right (which I didn't realise at the time), and I didn't realise at the time how much they were affecting me. However once I changed those things, the depression cleared up completely.
YMMV.
The gaslighting comment is all too real. I wonder what's wrong with me because I don't feel contented. I feel like a fake all the time and then I feel like a fake for feeling like one. It's madness. Somehow I'm still able to carry on, but it's not fun.
The best therapist I ever had was an older man from upstate NY who practiced zen buddhism. He was technically a psychiatrist I suppose but we had incredible talk sessions and he helped me manage it during the worst episodes (first years of college), because we mostly just talked about poetry or writing or anything but normal therapy territory. I'm not sure where he is at now but I would like to find something similar to that. But to be honest I'm pretty burnt out on therapy and my mood swings make it hard to build a consistent rapport with most practitioners. Also therapy is INCREDIBLY expensive and many don't take insurance. It feels screwy.
https://en.wikipedia.org/wiki/List_of_psychotherapies
Cognitive behavioural therapy is one of the well known ones and to my understanding tends to focus on concrete patterns of behaviour rather than digging out some deficit in parental relationships https://en.m.wikipedia.org/wiki/Cognitive_behavioral_therapy
Totally amateur here but unfortunately a bit familiar of depression. What you described sounds like a familiar pattern and CBT was helpfull in that.
"Clinical" depression is not depression that is caused by chemistry rather than psychology. We have no idea whose depression is caused by what, really, and chemistry/psychology probably isn't a meaningful distinction to make in this context.
As far as I know there is no expert consensus on whether depression and Depression are different shades of the same thing or qualitatively different.
'Depression is a chemical imbalance', as a model, is about on par with 'the internet is a series of tubes'. It's not flat out wrong, but it's so oversimplified as to be pretty useless for fixing or making predictions about the system.
I dunno, I just don't feel anything. Good things, bad things - it's all "OK. Next."
But my general mood is leaning towards negative.