Don't compare yourself to other people and their "level of success" (whatever that means).
We don't know what others have gone through or the circumstances they have overcome to reach their position in life. Let their success motivate you to do more, learn more and put forth the WORK necessary to reach that level.
The only person you should compare yourself to, is YOU. Who were you 1, 5, 10 years ago? Are you happy with the change or lack there of? Be objective about your answer and make the necessary changes or continue grinding forward my friend, good luck!