Responsible For My Happiness And Decisions

If we are responsible for our happiness, and it doesn’t matter what decision we make, how do we ever make a decision? How do we know what we really want if all things can make us equally happy by just thinking differently? I’ve asked for help on a few decisions in this class and the coach always asks if both could turn out perfectly what would you choose? Sometimes I get stuck there because If both decisions end perfect, and I am happy either way, I still wouldn’t know what to choose. I hope that makes sense.