I experience the same thing except the thoughts are mostly muted into whispers or negative feelings I believe are coming from others to protect myself from any possible harm I could encounter from others. I think we are just channeling our Anxiety and lack of social skills into different ways and it manifests as these "voices" of ourselves trying to protect ourselves from harm or embarrassment. Maybe you are trying too hard to be someone you are not or you are afraid to face something and it is making you hear those voices. Maybe if you tried being more true to your self the voices will stop.

I hope you feel better soon.