practice makes perfect, as they say. so, even when you don't have strong expectations about something, it's a good idea to practice thinking about the future positively. for example, begin an ordinary day at work or school thinking about all of the things that can go right that day. doing this on a regular basis will help you create a habit of expecting positive things!
so many of us have gotten into the habit of expecting the worst in order to prepare for any worrisome situations. i won't deny that it's important to be prepared for things that can go wrong, but there is a balance between being prepared and expecting 