How is the serious wear of the left heel of sneakers?

Don't worry, this is the way you walk. No matter what shoes I wear, I always wear the outside of my heel first, and my left foot is a little worse than my right foot.

This is mainly because when you walk, you first land on the outside of the heel. At that time, the force was great, and naturally it was badly ground there. There is nothing wrong with this walking posture. Many people do it (including me).