From people who have actually gotten into a fight with their martial arts, what’s something that the dojo never warned/taught you of, and how do you prepare for it?

14M here in Sogo Bujutsu (pretty obscure self-defense based martial arts), I’m proud enough to say that in the two years of my martial arts training I’ve managed to keep the peace with everyone long enough that I haven’t had to use it. Now that being said, it’s led me into a thought that when the moment may truly arrive, I’m going to be caught off guard and end up losing with little matter regarding whether or not I would be caught off-guard and end up losing with little difference regarding my training. People who have actually had to use it, what would your input be on this?