I'm sorry you're feeling that way... I think it's good you keep a journal, I think writing helps to release upsetting emotions like anger, sadness, etc. It sounds like moving was really hard on you... my mom kept losing her job when I was in high school, and I ended up going to three different high schools before I graduated, so I know how it is.
I was always the more emotional angry type...I know what you mean about getting pissed and crying, I always cried when I was really angry, especially when I was younger, and never really knew why I reacted that way, the emotion was just so overwhelming and I couldn't really help it. My brother was more prone to violent anger... shouting, hitting things, etc. He started taking martial arts when he was about 12 and it seemed to really make a difference in helping him control his outbursts. My advice would be to find something you enjoy to focus your mind on, something you can really get involved and lost in, so that you aren't just dwelling on the things that are upsetting you... I hope that you find something that helps