Is there something that no one knows or few people know about you? What might that be? Maybe you are a person that no one would expect to have attempted to spend the night on Tom Sawyers Island - only to get caught at 2pm while roaming the island (this happened to a friend of mine).
Maybe you were part of some sort of protest. Maybe you only like milk chocolate as opposed to dark chocolate?
PS: I was part of an protest when I was 21. I told my parents that I was prepared to be arrested if it came to that (luckily it didn't) but my parents said I had to stand for what I believed and they would bail me out if needed.