I guess it's an entity from the astral plane you either channeled, create yourself (what I don't think) or attrackted with your thoughts. Maybe an earthbound ghost. Could be any energy though if that's the way you see spirits/energy, that's how a friend sees them too; just shadows. Nobody except yourself can answer you what it is or if it's negative or positive. Maybe it's just nothing. Just keep your vibration high. I wouldn't worry, and I worry alot :)