Get What You Want
Think about a decision you need to make. It could be arranging furniture, changing careers, or what to have for dinner.
Now think about how much time you've spent "deciding". How much of your day do you spend with that decision on your mind? Once you've made the decision how much time and brain space will you have? Making decisions gives you more time because you're able to move on to the next thing. When you avoid making a decision which is really what you're doing when you say you're "deciding" you procrastinate and dwell instead of moving on.
Are you constantly stuck in indecision and don't know why? It's because you don't have the confidence in yourself to make the decision.