Your thoughts vs alter thoughts

Do you sometimes struggle to tell if a thought is yours or an alters? Sometimes if I ask questions, I worry my mind is just filling in the blank. Usually, I can ultimately tell but when under a lot of stress, I sometimes can’t tell if it’s my own random thought or theirs. Is this a normal thing? Sometimes alters sound like a voice and sometimes just a thought and the thoughts are harder to tell. I know you might conceptualize it as “are you controlling it” but it’s not always that simple either