You know that feeling when something seems too good to be true, when we are waiting for our 'bubble to burst?' Some people can't get over this feeling, and their good fortune takes a sinister turn in their mind.
People who have an irrational aversion to being happy suffer from something called "cherophobia."
It comes from the Greek word "chairo," which means "I rejoice." It basically means that they are afraid to participate in or accept anything good or fun.
Some symptoms are -
Anxiety when you're invited to a social gathering.
Passing on opportunities that could lead to positive life changes due to the fear something bad will happen.
Refusing to participate in "fun" activities.
Thinking being happy will mean something bad will happen.