Am I bipolar or depressed?

So, I read how the moods CAN last for a few hours, but it's rare. I am 12 years old, and I don't think it is hormones because I've always been like this. I remember as a kid If I felt to loved I'd leave and just sit alone, until I felt, well, "alright" I guess. And a few summers back, I was really depressed. Like, so sad I wouldn't even want to get up anymore. And then you know after that I was happy but still really depressed sometimes. And then earlier this year I felt so terrible for I think like 3 months and I even used cutting as my coping mechanism. But then one day after feeling so terrible I stopped cutting and I felt okay, sometimes super happy, sometimes just happy, or feeling numb. Then lately (earlier this month) I have been feeling depressed, like I started cutting myself again, but I've stopped now because I just feel numb right now and sometimes I'll get these times where I'm litteraly bouncing off the walls. I never really had any trauma as a kid, exept a little bit of bullying, and as a child my dad drank, he wasn't violent but very mean, he's not an alcoholic, actually he hasn't even touch beer since I was young. I don't think that anybody in my family has bipolar. I have a feeling my brother is bipolar though too. So what do you guys think? I already have an appointment with the doctors about this, so don't tell me to go there. Thanks yu guys :)