I can provide some information on the topic you are asking about.
What you seem to be describing is a phenomenon sometimes referred to as "inner speech" or "thinking aloud." It's the process where individuals have a monologue in their minds, talking to themselves about their thoughts, plans, or events that are about to happen. For some people, this inner speech can be very vivid and audible, almost like hearing a voice speaking in their minds.
While it is a natural and common experience for many individuals, it's not a universal phenomenon. Some people experience their thoughts more as abstract ideas or images rather than verbal inner speech. The experience of inner speech can vary in intensity and clarity from person to person.
If you are interested in exploring and understanding your own inner speech, mindfulness and meditation practices can be helpful. By becoming more aware of your thoughts and observing them without judgment, you might gain insight into your cognitive processes and the way you think about future events.
However, it's essential to note that any unusual or distressing experiences related to thinking or hearing oneself should be discussed with a qualified mental health professional, as it could be indicative of certain conditions that may require attention and support.