Most of the times we think we are "sound" and better than others. We keep carrying this in our head - "if you take average score of intelligence, i am above average than most of the people". We fail to understand that all of us feel the same way.

Feel happy - everyone is wired that way.
Our brain works and everyone's brain is wired for biases and fallacies. Our excellence lies in knowing these biases (making us counter productive) and putting checkpoints to bring some sense - an order from chaos. Only when we understand our biases and put some checkpoints, we will be making some sense.