How to tell the difference between intrusive thoughts and voices

I’ve never been diagnosed with anything. I’m 23 and have shown signs of having psychotic episodes for over a decade, I deal with it extremely well however because I’m so high functioning. Anyway...

I’m pretty sure I’ve never heard voices, but a few years ago I remember having what I thought were intrusive thoughts, which I still occasionally get now (when not psychotic), sometimes in my own voice but sometimes in other people’s voices, like people I’m closest to, just saying random things. I can’t remember what they said, it wasn’t either good or bad, they were just random, non-sensical most of the time. Sometimes it would be a sentence or two, sometimes random words “red” “drawing” “funny” hair” “boring” “ugly” “paper” “Harry Potter” ...you get the idea, haha.
One thing I will say though, it had a specific location. It would be in the back, right corner of my mind, sometimes on the left, and sometimes back, centre, so very location specific, but always inside my head, never outside.
Also, since being very young (before going to high school, before 10 years old) I have heard my voice being called, in multiple different voices, in multiple different ways (whispers, shouting, etc), just randomly, out of the blue, and that is always external.

Besides my multiple paranoid delusions (extremely long story as it goes back more than a decade), I have also had a sense of being followed and watched by something almost all my life. No matter where I go or what I do, or who I’m with, I always feel something there, watching me. I don’t believe it to be malevolent like I did as a child, and believe it to be spiritual in nature (someone close to me died when I was a child and I don’t remember much before that so believe it to be them).

Thanks. Peace.