According to Psychology Today, perfectionism is especially harmful when you begin to think and behave in the following ways.
I am only as good as my last result
Perfectionists condition perceptions of their own value with results achieved. But they often forget long-term results and see only the most recent ones they don't consider to be perfect. That is very stressful.
I mustn't fail
Perfectionists are able to perceive only two opposite extremes: perfection and failure. Rather than trying to achieve a perfect result, they are governed by their fear of failure.
They want to avoid failure at all costs, which leads to risk-taking and an inability to learn from mistakes. They focus so much on themselves that they can't treat failure as an experience from which they can learn to do things better.
I won't finish until it's perfect
Perfectionists tend to procrastinate completion of their tasks until the results are perfect. But such a state may never arise. The same tendency often prevents them from starting work on a task because they are afraid of imperfect starting conditions.
If you too have such tendencies, beware and try to change. Perfectionism can be very stressful and negatively affect your life in terms of physical and mental health, relationships with others, work and pleasure.
Read when good is enough.
-kk-