Well Regulated - by definition means - equal to "Regular army" - read the constitution about males 17-45 being in the militia and required to have their own rifle of same make/caliber. It's spelled out pretty clear.
But we're not here to argue that, for *OR* against.
To protect yourself, use Martial Arts - period - you can't stop bullets with it but you can protect yourself.
Mace (CS) or Pepper Spray (There is a difference) - you can get lax with it and forget it, lose it, get your purse stolen.
Cans go flat or lose their pressurization - too much reliance on an object..
I am for firearms, HOWEVER - you cannot carry firearms into places that serve alcohol.......so those are out..
I cannot get my hands stolen, Karate literally means "empty hand" - learn it or take some self defense classes but practice practice practice.
Or take up boxing and buff out, but at least with Martial Arts you'll work up some hip muscles and get a feminine shape !! (There is some validity to that but the excercise rocks).