it sounds like a lot of terrible things have happened to you in your short life? and maybe you haven't ever had someone there to help you manage your feelings or make sense of these situations, but you've been left on your own to just cope. I wouldn't even have understood what good help would have been like; "help" usually meant someone making things even worse.
If you have a bipolar diagnosis, then are you in therapy? have you spoken to your therapist about this? I would say you were distancing or dissociating yourself from your feelings as a habit, not really as a bipolar thing.