It's pretty easy. You always get what you focus upon. When something happens to you and you think about it, that's where your focus is. When you think about the past, that's where your focus is. Most people just observe what is happening to them, so they don't use their ability to focus deliberately. What they get out of it are mixed, seemingly random results. But you can go about it in a different way. You can use your Now to decide what you want, because when you know what you don't want you know what you do want. And instead of focusing on the unwanted that is happening in that moment, you use it as a springboard to focus on the wanted. It's irrelevant what has happened to you or what is happening right now. You have only power over your future and this power lies in your Now.
"Self-abandonment. That is the secret. We have to abandon ourselves to the state, in our love for the state, and in so doing live the life of the state and no more our present state. And to make the state alive, one must become it."
Neville Goddard ~ The Law and the Promise