This, this and this. And just like how kids who spend too much time in sanitized indoor environments are more likely to develop allergies and other autoimmune disorders, kids who are kept psychologically sheltered to too large a degree are more likely to develop anxiety disorders as adults.

When "getting everything perfect" is normal to you and not a refreshing exception, you feel like you're a screwup most of the time even when you haven't done anything wrong besides being too hard on yourself.