I grew up as the littlest kid in the class. By a significant margin. They started trying to bully me, but my dad had taught me how to box and how to take a blow (two very separate lessons). I broke a kids nose on my very first day in school. 6 years old :) I never lost that attitude even when I got big. And I did get BIG.
There was a fairly legendary time when I refused my ritual hazing on the football team. 4 seniors and I fought and lost. So I beat them one at a time over the next couple years. But the coach said if I wanted to be on the team I better learn to get along.
The consequence is that I have been ready to take on bullies all my life. And God help a Pedo if I knew about it.