There is nothing wrong with striving for excellence, but perfectionism makes you a slave to success.  No matter how well a situation turns out, it is hard to embrace and enjoy the outcome because your mind finds some way that it is not perfect. 

Perfectionism is not really about doing something perfectly.  It is about the feelings of self-worth you are striving for with a flawless performance.  And yet, the standard of perfection that you carry around inside you keeps you from feeling any sense of accomplishment. 

Instead of anxiety being a normal and natural part of your life, you start to get anxious about being anxious.

One of the ways people try to deal with anxiety is to control it.