Recognize and accept the fact that you will not be able to control and solve all uncertainty and that you don’t need to. You will be anxious about that, but it's normal.

This will make it much easier for you to simply make a decision and move on.

This happens when you don't possess the knowledge about the consequences of the mistakes in your life now.

Thus, the most important thing for people that want to become more confident decision-makers is to start making some mistakes on purpose. This is train your brain to not see mistake as something dangerous, even if they cause you embarrassment.

Many difficult decisions imply a degree of helplessness and lack of control.

People who make decisions confidently built up a tolerance to feeling helpless and out of control. They’re move on with confidence, without all the stress and anxiety that go along with indecision.

Reassurance-seeking tells your brain that the anxiety that goes along with making decisions is dangerous.

So each time you face a decision that makes you nervous, your brain will make you feel even more nervous.