Just wanted to expand a bit on the self defense. 
1. Don't show weakness, even if you get hurt, try not to show it. ie: reacting
vocally (ouch, crying out, holding injured area), your just letting the aggressor know where to hit harder.
2. Don't get angry or show fear, either will lose the battle or paralyze you. Save the fear/emotion till after the situation is over. Cool heads prevail, anger will cause you to make rash or improper decisions.
3. Don't expect, even with years of training, to not get hurt. You punch somebody, particularly a bone or teeth not only will it hurt, but could expose you to infection, if you cut your knuckles and get blood/saliva on your cuts.If you get punched or kicked, it doesn't matter how well trained you are, it still hurts.You get thrown or fall on the ground or into a wall, yes it will hurt. Just don't expect a magic shield to protect you, but if you do get hurt, the trick is to not show or respond to it. That will just draw more attention to striking that area.  Mrs. Prepper