Pull out the black belt you bought online for 20$, put it on then start doing what you think are karate poses. If that doesn't scare them, punch one of them in the throat as hard as you can and hope they try to help their dying buddy while you run like a motherfucker.
If they don't, unbutton your pants and let them drop down a bit, then rip your shirt a bit while you scream "This gang of gay guys is trying to rape me!". If that doesn't embarrass them enough to get them to stop coming after you, turn around and punch another one in the throat while you continue to scream rape and run in the other direction.
Repeat this process until they are all dead/unconscious, they give up, or the cops arrive.