Dr. Norman Doidge, M.D. in his book, The Brain That Changes Itself: Stories of Personal Triumph from the Frontiers of Brain Science, states that our brains are not rigidly mapped out as scientists once thought. Instead, by thinking differently, our brain has the incredible capacity to form new neural pathways (source).
If you’re prone to negative and doomsday thinking why not switch it around and practice for one week thinking optimistic thoughts. Think about how good things have been and how well things you are working on will turn out. All you got to lose by trying a new way of thinking is setting aside negative thinking and a depressing attitude. C’mon, you can do it.