Is it normal to argue with another voice coming out of your mouth?

Hey all
Just recovered from an argument with myself. Basically, what's happened is I was feeling depressed all last year, and recently started to pull myself back together. But, I've always had these two voices in my head arguing with one another.
Now tonight, about an hour ago is I got angry, and then just started arguing with myself. The first voice that came outta my mouth was low pitched, saying I was pathetic, weak, a psycho, a dickhead. Another voice, a higher pitched voice, kept saying "I don't wanna go back to being like this. NO, I don't wanna, I don't wanna."
This has been going on inside my head for months, but today it's actually come out of my mouth in those two different voices.
Someone please help because I feel like I'm going insane here.

PS - This isn't the first sign of schizophrenia is it, 'cause I've read up on it, and scizophrenia and manic depression occur during people's teens (which I am).
Hey, please no christian or religious stuff. I'm not a total believer in God or anything (I won't say I don't think he exists, but he hasn't visited our world for some time.)

More details then on today: kids in my street always being annoying, hitting me, my sister and my brother, but I try to remain nice and calm because I've done some crazy things in my anger. Then today they filled a water balloon with sh*t and trhew it all over me. SO i..went over the top mad and tried to beat them all up. Then, after I came back home (after not beating them up) and all the shit above happened.

Thanks guys, and please, no religious answers.
 
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