system
A chat on subreddit /r/NoStupidQuestions
human
LUCKY! it's definitely normal at my school. Middle by the way, the kids here are honestly dramatic asf. I said your mom to a kid once and he gave me a death threat lol
gpt
Not legal advice and don't actually do this but maybe pull a fire alarm and call the police when you think it's about to happen then when the police arrive stick by them and tell them. 

Either that or tell a teacher you think would help you. A male that's tall and stern.

Also if you're walking home you can call 911 and ask for a police escort.