There are many reasons you can lack confidence at work. Maybe you’re in a job that requires skills you don’t have, or you’re less experienced than anyone around you. Or you’re new to the company and feel uneasy about your ability to succeed. Or you feel threatened by colleagues, fear losing your job, or are simply too hard on yourself. Public humiliation and errors in judgment can also do the trick.

There’s just one most common reason, though, says Lynn Taylor, a national workplace expert and author of Tame Your Terrible Office Tyrant: “Overall, the most common reason that employees lose confidence is very simply because of a bad relationship with their boss. That insecurity will last as long as the relationship is strained.”

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