Here are some thoughts for anyone reading this…
Most people think that they are doing better than most of their coworkers.
You may say, “but I feel like I’m not doing too well at my job.” That would put in the minority then. Most of your coworkers think that someone else is the problem. Everyone allows for the possibility that they are not preforming perfectly, but those are just minor discrepancies in a stream of better than average work.
This is all about perspective. Many individuals only see their work and not the work others do. Without knowing it, one can judge others on how helpful they are to achieving their own goals, not those goals assigned to the others they are observing. Without the proper perspective, you can’t judge the performance of your coworkers.
Keep in mind that this is possibly an issue your manager has with you. Your manager may judge you on how well you are helping them achieve their goals, while not truly understanding how well you are working toward the tasks assigned to you.