Wondering About Schizophrenia, Do I Have It?

I'm fifteen and I think I have schizophrenia. For the past five months or so, i've been having a really depressive stage. It began gradually, then showing symptoms of mania, and I thought I was manic depressive, as depression runs in my family.
I would be very happy one minute, then all of a sudden, I would get mad at my friends, or family for nothing at all. I had come to the conclusion I had manic depression, but I think I might have made this conclusion too early.

Ever since I was little, I would see things. Minor halucinations, and a lot of the time, extreme things. Mostly these would happen at night, but recently, they have been happening all throughout the day. I feel very paranoid, constantly. I have a paper route which I have to do in the morning, and I feel as if people are going to attack me, or a dog will chase me, pretty much anything which I might be afraid of. I will see things in the corner of my eye, possibly a car, or a box, and it will turn into something instantly, and I will be very afraid. I will have to check if its actually there.

While I was walking home from my girlfriends house last week, I passed through a park. I was listening to music(the doors, maybe that contributed? Haha.) and then all of a sudden I felt a strange sensation under my feet. It was only unlevel dirt, but my brain thought I was walking on corpses, piles of corpses. I knew I wasn't but then I was so afraid to look down to find if I was. I had looked down and realized I wasn't, but I couldn't help but think I was walking on them. Finally, the thought disapated, and I felt secure again. I walked further through the park, and then had to tie my shoes. There were vines growing through chainlink fences, in which you can sort of see through, all along the park, and I was by it. I happened to glance into it, and all of a sudden I was overcome by the greatest fear I have ever felt.
I thought someone, or something was going to get me. I have thoughts like this constantly, but nothing like this. I tried to overcome the fear, I tried to believe it wasn't real, but I couldn't do it. I began to run, as fast as I could, I ran for five minutes, while crying, until I got home. This was finally when I felt secure.

This is only one story, but I feel thoughts like this constantly. I will hear voices in my head on occasion. They are very subtle, and hard to hear though. Also, I was listening to some music a couple months back, and I began to think the band was trying to tell me something. I had heard voices telling me something, I don't remember what they said, but I had believed it strongly. Until I read about the symptoms of schizophrenia, I had still believed it. It had even happened on multiple occasions.

I have my eyes checked regularily, and as the doctor says, I have perfect vision. Constantly, light will interfere with my vision, and I wont be able to see anything. This dosen't mean the sun is shining, I mean any light, from a street light, a minor reflection, will have me blinded.
Also, for the past week I have felt a feeling of 'spacing out' often. It feels very similar to the effect you recieve after smoking marijuanna. Except, it's happening more often, and not as extreme. I will be walking through the hallways of my school to my locker, (aprox 3min walk) and I may have one of these 'trips' 3 or 4 times. This is more of a recent thing, as the past week. The other things have happened many occasions.

There have been many other halucinations, feelings of paranoia, a lot of confusion, voices, and a lot of other things I just can't think of.
If someone could reply, give a diagnosis possibly? Some tips, help me out, I would really apreciate it.

Thanks, cory.