If you are feeling insecure because of that pimple on your forehead and you refuse to go out in public for fear of what people will say, you need to smack yourself out of that delusion. Why? Because no one is going to see, care, or even think about it as much as you assume they will.
We all tend to judge ourselves harshly. Whether it is feeling guilty for eating that extra slice of pizza, or criticising ourselves for not being productive enough, we often hold ourselves to impossibly high standards.