I too had hallucinations (mine were auditory and visual) when I was in high school. I did tell my mom about my auditory ones because it bothered me more that I was hearing this voice that would sometimes say my name, than seeing Jimi Hendrix in my Spanish class. lol. My mom's reaction though was that she believed I was "making it up" and somehow "pretending" to hear voices. So I decided to never mention any of my hallucinations to her again. When I was almost 16, I lost one of my best friends and the day I found out, I saw what I call his ghost in front of me as if he were actually standing there. I told the guidance counselor who was meeting with students who knew my friend and she said it was normal, and while in that instance, it may have been a "normal" thing, I interpreted my various visual hallucinations as "normal" for a long time until someone else told me that what I was experiencing wasn't something everyone did..