How common is it to know self-defense but you never had to use it in real life?

I can actually handle myself (having aces under my sleeve basically) and have fast reflexes. I don't need male cousins saving me from a wannabe abusive, loser. However, I keep a low profile.

Besides play fighting with both genders, several competitions and all the training over the years, I never needed to use it against anyone. Basically I have the skill to neutralize or hurt an abuser (I know when to stop though) but I never had to use it. How common is this? Yes you know self-defense but no one ever mess with you, you never had to defend yourself?

How common is it to know self-defense but you never had to use it in real life?
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