The polyanna syndrome         

I ´ve never heard about the pollyanna syndrome, until in my english class the teacher expleaned about this personality type.

A pollyanna refers to a very optimistic person. The name comes from the heroin of a 1913 novel, Pollyanna, who had an overly optimistic outlook on life.

Pollyanna have positive viewpoint of life, pollyanna people think that all is for the best, but in my personal opinion this kind of person are unrealistic, because you do not have to be pesimist but you have to be concerned about what is happening.