Can someone teach me how to make a protection spell?

I have some pretty awful roommates at the moment, and I can really feel their gross, negative, hateful energy leeching onto me in a bad way and there’s nothing so far that I’ve done that can shake it off. And in general, this is also just how I feel about my college environment so far and it’s bringing me a lot of unnecessary anxiety and doubt.

I’m not familiar with spell work other than some brujeria practices I grew up with, but I would like some help as to safely create a spell that protects me/ helps repel any negative energy away from me.