Your mind is often your greatest tool, but as anyone who has been taken over by fear, frustration, or worry knows, it can also be your greatest enemy. Whether you're concerned that you don't have the respect of your peers or that a customer isn't calling you back because she's gone to a competitor, over thinking the issue only serves to compound the worry. Instead, pretend you have what you want.
Act as if your peers respect you or as if the customer is loyal.
These may be fantasies, but what you're worrying about may be as well. It's better to stop the worry and act confidently; chances are better that you'll get what you want.