Depression: Help Needed?

I am thirteen years old, and I have been depressed for quite sometime now. Right now, my chest feels like I am having a heart attack. Of course I am not, but I feel like my heart is going to pound right out of my chest. It hurts so much, and knowing the weekend's coming, it hurts me more. Do not take me wrong-- I love the weekend. It is just that.. when I am at school, I can sort of distract myself from feeling down. At home, I feel more trapped. The only thing I enjoy doing is playing my guitar, and listening to my music. I've seemed to loose interest in so many other things. I just feel so down sometimes, and there is someone I can trust, but I have no idea how to approach them. It is one of my teachers, and I am really starting to bother him, I think. I do not know for sure, but I emailed him the other day and told him that I've been feeling really dizzy and that sometimes I feel like I do not know where I am or what is going on, and who anyone is, and I get that feeling a little. He replied acting as if he cares, but I think I am bothering him. Anyway, if I do tell him I am depressed, he will half to report it to the office, and the guidance counselors are terrible. They misunderstand, and they always have to tell your parents. I cannot let my parents find out any of this. I know people think that no matter how hard it is, you must approach your parents, but sometimes, you cannot. You simply cannot. My parents do not believe in depression. In fact, everytime I try to tell them, they do not believe it, and they think I am too young to feel worse and depressed. I mean, I even think of suicide sometimes. I know I am not going to hurt myself at all. Just thoughts about death sometimes. I know I am not hurting myself though. I have seen a professional therapist before, but that is because at a appointment with the doctor, he thought I looked upset, so he made an arrangement for me. My parents tagged along with me, but they sort of gave up. They think I am just one of those stupid drama-queens, with nothing at all troubling me, and that I am a person going through attention-seeking ways. I truely do not mean to sound this way. I truely need help and I have no clue what to do.

Any help?

If you trust this teacher then I would ask for his advice. Or maybe you could go to one of the counselors at school yourself. If you do tell the teacher then I'm pretty sure he will tell a counselor. Not sure if the counselor will tell your parents or not. But maybe that wouldn't be such a bad thing. Maybe they could get through to your parents in a way that you couldn't. Whatever you decide to do in the end your parents will be involved since you are a minor. Depression is not something that will go away in time. It could get worse. And trust me you don't want that to happen.