Do you hear your own voice inside of your head or outside of your head?

This kind of reminds me of intrusive thoughts or thought insertion... Both of those can go with a lot of things, including something like OCD or some kind of mild psychosis if it's thought insertion. Are you seeing a therapist and/or a psychiatrist? I can only make guesses based on what you wrote and I'm no professional, if this is bothering you enough which it seems it is I would recommend that you speak to a competent mental health professional about the matter.

Do these same kinds of thoughts repeat in your head throughout the day, sounding like your voice is telling you these things?

I think it's certainly possible to hear a voice that sounds like your own voice, but that's just my non medical opinion.

Best regards to you!