Mac pauses at 50% when booting.

Hello,

i have a school MacBook Air. I was working on google drive when I had an error "this system extension cannot be used" and then another, and another. I had so many of them that I had to just keep clicking as fast as I could. I attempted to shut down my computer, and reboot it. It now shows the apple and progress bar and it only goes to 50%. Since I am not admin, I can't reset PRAM or NVRAM. I can't boot to single user mode, or Restore mode or verbose mode.