Similarly, I've been anti-confrontational all my life, until I got in a car wreck where we were rear-ended on the highway and thanks to the airbag I really just had the wind knocked out of me, but ever since then I've figured getting punched in the face is probably not worse and can handle more stressful situations now. Still haven't been punched in the face tho.
i was mugged once, got jumped from behind by about 4 people and beat up pretty good, idk about anyone else but getting hit really hard in the back of the jaw with a fist is not something you instantly shake off and respond to like in the movies. I went down like a load of bricks and it took 30 sec for me to figure out what was even happening. That whole time I was getting kicked and hit more. By the time i was even capable of getting to my feet it was over and my pockets were empty.