You need to realize, first and foremost, that while you can’t directly control what happens to you, you can control your focus.

This is too true. I would be lying if i say I've never been depressed. I've always had self esteem issues. When I was younger and even till now sometimes, when I'm depressed i seek an escape. Nothing self destructive. I love reading. So, i would stick my head in a good book and not come up for air as long as I can.
Now, I make myself too busy to worry or feel down. But I know I might have to stop sometime.