I have always been a daydreamer too. Even teachers in grade school used to write that on my report cards! I agree with someone above who mentioned daydreaming in itself is not a BP sign. That said, when mania is in the mix, my daydreams turn into delusions, whether grandiose ones or paranoid ones.

Channeling your day dreams into something positive can be good, such as through writing or art. Some of the greatest, most interesting and successful people have big imaginations. It's nothing to be ashamed of, although I understand how you must feel when you do say things out loud and having people not understand.

We all have our little quirks though, so try not to be hard on yourself. Also, you might also benefit from mindfulness and meditation. I find that meditation helps you get in touch with your imagination, rather than stifling it, especially using Guided Imagery. You can find these exercises on youtube. Other mindfulness exercises can help you stay in the 'here-and-now' during times where we must focus on daily tasks, without imagination preventing us from getting carried away and distracted. Imagination is a strength though, so own it!