You don't have to go nuts to be bipolar. If you are not going manic I would look to see if you had self destructive tendencies in your past like quitting a job on a whim, getting erratic with your friends over nothing etc. If you have them combined with some of the other symptoms of the chart I would speak with a pdoc. Here is a great video describing the differences https://www.youtube.com/watch?v=AM7vf5HJxaQ