A lot of us often go through unpleasant emotions when we think about other people's achievements. If they are doing better than us, we begin to feel an inferiority complex and if they are doing worse than us, we tend to develop a superiority complex. Both of these feelings are wrong.
Everyone has had a different journey and we should all just accept our own personal reality and be happy with it. Theodore Roosevelt Jr. (26th President of United States of America) once said, "Comparison is the thief of joy."
Indeed, if we just started improving ourselves instead of comparing ourselves, we would all be able to move towards a greater goal and find purpose.