I stress and think so much especially when its exams time and family problems. my thoughts always goes to negative side what can i do?

With Brain Training!: Go goth,wear black,avoid the sun and write dour poetry. OR: try to break the habit. We all have habits, and modes of thinking are difficult to change, but you can do it if you are persistent and patient.A good book is called "Learned Optimism,"by Martin Seligman. Books on simple meditation also help you to train your mind to quiet down and be more of an observer rather than a participant.Fear not