Do I have slight bipolar depression?

So I've just started to notice that I've been having rather violent moods swings. One day in the morning I might be the happiest person you'll ever meet then after lunch I'll be quiet and withdrawn and wishing people would leave me alone. Only two or three people can get me to talk in full sentences when I'm in my "bad moods" and that's my two best friends and my boyfriend. I've been dismissing it as teen hormones because I'm 13 but I really starting to get worried. My mood swings have been getting worse and I've had two suicide threats. I'm afraid it's bipolar depression because one day I'm on top of the world and then I'm wishing I'd die. If I do have bipolar depression then it's only slight because when I go manic I'm not a madman or anything. So? Am I?