Trapped, School, Fire, Dead bodies?

Okay, I don't usually have dreams that stand out too much to me lately, but I was wondering what this dream I had the other month may mean. I can't remember every little detail anymore, but i remember mostly everything.

I went into school just like any other day and went to go to my locker, but instead I went to someone else's locker because I wasn't really paying attention I guess, but one of my best friends who's a guy was there opening his locker which happened to be about 3 down from whoever's i was at. So, i was talking to him for a minute or two, but i dont remember what he said anymore, it was just normal conversation though. then i guess i wanted to break into the locker to get money and i did. i think i did it to the locker next to it too, then my friend laughed about it. hes not the most law abiding person out there if you get what im saying, so i dont know if those two things were connected? i didnt do it to impress him or be like him though, i just wanted some money. anyways, i realize that im going to be late for class because by then the hallways are empty, but i go to the cafeteria instead, which is what i usually do in the morning, and when i got there two of my close friends where there because they waited for me, but everyone else had gone to class. as soon as i walk in and say hi to them and stuff the lights turn off, and all the doors lock. i could still see because theres like a wall of windows in the front and back of the cafeteria, but it was still not as bright. i was in the front with them. i didnt really look at anything when i walked in because i saw them first because they were near the door and what happened was right after i got in. so anyways the room catches on fire, not everywhere, but a lot of it, then i see hundreds of dead bodies pulling themselves up from the floor and tables. most didnt have their full bodies, and none has skin, it was only muscle and stuff, and they all started coming towards us, then my dream was over.

i never felt scared in my dream or when i woke up though.

do you have any idea what it means?