Afraid to Win?

In reviewing my matches, I've come to a conclusion- I am afraid to win! Yes, it's true. Why is another matter. How can i win 5 to 6 matches in a row against players one to two hundred points higher in ratings, yet lose games i should have won. Moreover, i cannot explain the difference in my playing style which resulted in victory.  Is there some missing area im not aware of. Any ideas. I would love to hear from you.