You're not being a burden by sharing your secret with other people; they'd most likely appreciate your honesty and would try to understand what you're going through. I didn't tell any of my friends for a long time, and they honestly thought I was just being crazy for no reason... they were relieved when I finally told them. When you "come out" as bipolar, you have to be prepared for different reactions. But know that your real friends will stay by your side, no matter what