Depression....an inisidiuos place to be, and yet, some of us, tend to want to stay there, regardless of how sad and unhappy we feel when we are there.
Most of us have had some period of depression in our life, but thankfully, most can get themselves out of it, before it becomes a "way of life".........but some of us get so far down, that the climb back up seems unreachable, and just too damn hard.
I've been there, and with help from medication and therapy, managed to climb out of it, and if I ever feel myself slipping down again, I remember what it was like down there in the dark, and tell myself, not to go there again.
I find positive thinking the best remedy....no matter how bad things seem, if you look, you will always find some positive, and that is what you need to concentrate on....Instead of looking at all the bad things around you, look at the good things, no matter how small, if you think of the bad things, they just get bigger and bigger, the same can happen with good things, they too, will get bigger and bigger too, and eventually overtake those bad thoughts.
I think, people who are depressed, sometimes think that everyone else around them, is leading a happy and fullfilling life, and that they are the only ones living a sad and troublesome life.....everybody has their ups and downs, we have to learn to accept that, and learn to deal with them as they happen....another good thing to think about is that we cannot change the past, we only have control of changing the future, it is up to us to concentrate on that, rather than to dwell on what has happened before.
I am no expert on the subject, I only know how I handled my own depression and recovery.