Growing up can be difficult. You see other children doing things you'd like to do. Your friends are rolling around effortlessly on bicycles, and you're still on a tricycle. You bravely attempt to ride on two wheels and immediately meet with failure.
Sharks can smell blood up to a quarter of a mile away. Over their ancient history as apex predators, they've developed a killer instinct that tells them blood is a sign of weakness. Some people are like this when they detect inferiority. They pounce on the person who's feeling inadequate and move in for the kill.
People are sometimes too forgiving. We mention this concerning how most people use the word "friend." If someone asked whether your friends were good or bad, you would unabashedly say they were good. You attach the word friend to positive emotions and feelings.
Do you always find yourself analyzing things that go on around you? Do you feel inferior to others more than just every now and then? Do you sometimes tell yourself you're worthless and incapable of doing things other people can? These are typical thoughts we get from time to time.