There is hearing voices and hearing voices. I will occasionally hear my mother's voice run a commentary on things going on in my life but I don't feel that I am deluded or paranoid. I've spoken to my psychiatrist and he seems to think this 'inner voice' of being critical of myself is normal.

But seeing things, having a conversation with these voices, acting upon them in ways you would not normally do, having a battle or argument with them, etc I think are signs something more concerning is happening.

Regardless you should be discussing this with your psychiatrist or even family doctor if you don't have one.