Deciding is way more important than you think. The purpose of life is to give it meaning for you, and if you don't, others will do it for you. So figure out what you want to do with your life, and then take the first step to make it happen. You might fail, and you can just get up again, or you can change your mind, but don't even give in to indecision. That will almost certainly stop you dead in your tracks!
And then of course there is the multiple universe idea, that basically says the universe splits whenever we do decide: we continue in the reality we chose, but all the other realities we didn't chose still exist also. So why not make this process a deliberate one?