I'd say that this sentence has a dangling or misplaced modifier. The modifier <em>when in highschool </em>cannot be used that way, because we don't know for sure whether that refers to the guidance counselor or you. The correct way to write this sentence would be: When I was in high school, ...
in third person omniscient narration the narrator has a gods eye view of the story and is privy to all characters thoughts as well as knowledge of the past and future. Then there's third person limited when the narrators innately tied to it then that's how you will know.
