Yes, I was in fourth grade, when the first plane hit they thought it was an accident, but my teacher kept leaving to go talk to another teacher who had walked into the room and said "they're saying it might be terrorists." I was in New York and so everyone said the "twin towers", but I thought they were talking about the Petronas Towers, which I knew of at the time because they were the tallest buildings in the world then. When the second plane hit we all got sent home. I understood that something really bad had happened but pretended not to in the car to try to get my mom to explain it to me but she only said she'd tell me later. We watched the news most of the rest of the day and learned about the Pentagon Attacks, United 93, the "bomb at the state department" and worrying about lots of other planes that may or may not have been hijacked. There was a church vigil that night to pray for the victims, and all the kids on the playground claimed to have some connection to Osama bin Laden.
I always figured you were older than that. I thought you'd be at least thirty (now).