" Why depression happens, how it finds us, I don't know, wish I did. All we can do is deal with it, try our best and hope. "
I'd definitely agree with (((( Warmsoul )))) there!!!!
There are things that I am carefully working at changing in my life. Things that can " trigger " or worsen my depression. And, by changing these things I hope to manage my depression better. But like you, (((( overachiever )))), I don't know where my depression comes from really. Why things that " trigger " or worsen my depression so severely don't seem to affect " normal " people to the same extent, or in the same way? Is there something " different "with my brain biochemistry? Or, is my depression linked to life experiences, personal temperament, upbringing, heredity? ( I'm becoming more and more convinced that my Father experienced quite severe depression sometimes. And possibly my Mother too? ) And, if I could get rid of my depression, would I even want to? In theory the idea of " curing " my depression could be good. But, if I were to remove depression from my personality would I be a better, healthier person? Or, if I were to remove the " thread " of depression from the " tapestry " of my personality, would the whole " tapestry " of my personality unravel?
In short, (((( overachiever )))), I'm as confused about my depression as you are. For whatever comfort it may be worth, I'm sure that you are sooooooo not alone!
And yes, I feel guilty too, sometimes. How is it that other people seem to cope with what seem, at least to me, greater problems than mine, better than I seem to be able to deal with my own problems?
However, in the final analysis, I'm back to agreeing with (((( Warmie's )))) thoughts that I quoted at the start of my post. However difficult I may find it sometimes, I'm starting to accept my depression as a " given ". " Beating myself up ", feeling confused and guilty about my depression doesn't do myself or anyone else any good. Anymore than " beating myself up ", feeling confused and guilty about my short sight and astigmatism would help me or anyone else.
So, I try to see my depression as just part of who I am. Not something that has to define me, as long as I'm mindful of it and take reasonable care to manage it, anymore than my short sight defines me, as long as I'm mindful of it and manage it by using the right corrective lenses.
And, if I've managed to make that sound easy, I certainly can't say that it is!

But, as a very wise person I know said: " All we can do is deal with it, try our best and hope. "
And, I most devoutly hope that you will be able to see your way to doing this yourself. You are, as is EVERYONE, a unique, precious, irreplaceable human being. And, I so hope that your confusion and guilt, that I so often share about my own depression, won't prevent you from seeing your own great, true worth.