The thing is, you can choose prosperity whenever you want, start small, just think of the best thing you can do with that moment, just the next five minutes, and do it. Don't worry, I'll wait, go.
You can do it!
Are you done? Didn't that feel good? Now just do it again, the best thing YOU can do with the next ten minutes of your life this time. Now just keep going form there.
You can't control anyone or anything outside of yourself, not really, so stop trying and just do the best you can with each and every moment, challenge, opportunity that comes your way. Every time you do you can do a little more and a little better than the last time until choosing prosperity becomes easy and automatic and depression becomes a part of your past instead of your daily life. I still work on this everyday, I'm far from perfect, very far, but I'm taking it one step at a time and I know you can do it too, if you just trust me and trust yourself enough to take that first step and then another and when you stumble, to forgive yourself and take another step. If I can do it, you can too.