Whenever anyone expects the worst they are setting themselves up for failure. You should always expect a positive response to anything because it will set you up for success. Thinking that something good will happen puts you in an uplifting mood and relieves stress.
How are you supposed to succeed when every time you go do something you think you will get a negative response? You are too afraid of rejection. Once you realize that rejection helps you grow, you will be able to relieve stress and expect positivity more often. Even criticism can be positive when you look at it as a way to improve on yourself.