Getting My Head Around This Concept

I am constantly reading that our life is in our own hands and that you can consciously begin to change ANYTHING by simply changing your thoughts. So, I suppose that means that if life kind of sucks right now, we pretty much made it happen by thinking those kinds of thoughts. I would say… I don’t believe that for a second, BUT, I’m reading those words EVERYWHERE! Going to have to give this some more thought. Must be something to it, just can’t get my head around it yet.