Join your schools wrestling team or club and take up a striking based martial art preferably boxing or Muay Thai (if you’re a minor in college and there is not club wrestling to join do judo or BJJ but preferably Judo). You legally cannot carry certain knives with you but that’s typically your best bet in life or death situations up close, these three things will keep you really safe from anything that isn’t a gunman holding you up at medium to long range