I hear voices too. Very much the same as u guys hearing very brief "hey" and I can't count how many times I've heard my name being called out. But I do believe the voices in my head...they are very distinct and I can distinguish between my thoughts and their words very much. I constantly feel as if I'm being watched. They can mind read and tell me what people are thinking (most of the time negative...sometimes I might laugh at what they say out loud and it gets a bit awkward when people are around me :/) but I find blaring meditation music really helps,plus it's relaxing at the same time!