What can I say Meef? I realize that most aren't trained, but realize that the battle is won or lost long before the first strike. If one rolls over and allows fear to reduce them to inaction, all is lost.
Gangs are made of cowards and as such, they don't want to get hurt let alone maimed for their troubles. They pick targets based on ease. You have a slight advantage in that they believe you are an easy mark, so you can generally slam the first one pretty good since they underestimate you from the beginning. All I'm saying is this...
I'm trained, this should be obvious, but anyone can stand up - I suggest you do if you're in such a situation. I further suggest you throw the fair fight rule book out the window and gouge their eyes out, crush their throats or something else medieval, after all, to do nothing is to die. The things I suggest do not take Bruce Lee or a strong body. Eyes - easy, in fact, play with a 2 year old and get your face close to them. They'll most likely poke you in the eye at some point and you'll be "out of the fight". This from a 2 year old that has no strength. Same for the throat, the temple, any joint, etc.
When you've got nothing to lose, go for it!