Getty Images Psychotherapist Amy Morin — who wrote the book "13 Things Mentally Strong People Don't Do" — wants you to know which 10 fears might be holding you back in life. Morin says that she sees a lot of people work so hard to prevent themselves from ever feeling anxious that they actually develop depression. Some of the problematic fears identified by Morin are: uncertainty, being judged, and failure. Visit Business Insider's homepage for more stories. Whether your fears involve your relationship, career, death, or discomfort, staying inside your comfort zone will ensure you live a small life. In fact, as a therapist, I see a lot of people work so hard to prevent themselves from ever feeling anxious that they actually develop depression.