Maybe it's just me, but I don't think puberty includes suicidal feelings. Emotional instability, yes. Suicide - is a horse of a different color though. Bipolar cannot (to my knowledge) be diagnosed until you are well into your 20s or early 30s. The symptoms you described though can be a variety of different things ... and it may be you have one thing, more than one, or are just way too stressed and it's overloading you so to speak. So really, the only way to know is to get yourself checked.