It's tempting to think that everything depends on this one big decision. That once you make your choice, your world will change forever. That kind of story has a nice dramatic flair if you're the audience. But it's incredibly stressful if you are the decision maker.
The reality, though, is that decisions are not one and done. As soon as one of the three components of a decision changes (the available options ,your objectives, or the information) you have an opportunity to make a new decision.
Once you recognize that, decisions won't have to be so big and scary.