One of my favorite authors is Deepak Chopra. And in one of his recent bestsellers, The Book of Secrets, he discusses doubt and it’s impact on decision making.

”Doubt is a symptom indicating that you aren’t in contact with the knower inside. It usually means that you are looking outside yourself when you have to make a choice. Your decision is going to be based on externals. For most people, the strongest externals come down to what other people think because fitting in is the path of least resistance. But fitting in is like embracing inertia. Social acceptance is the lowest common denominator of the self - it’s you as a social unit rather than you as a unique person. Find out who you really are; let fitting in be the last thing on your mind. Either it will happen or it won’t, but in either case you will be in no more doubt about yourself.”