I was in 7th grade. Grew up on a farm, only had the antenna for TV. My cartoons where cut, and the breaking news came on. I remember at first not quite comprehending (or at least in hindsight that's how it felt) and I still couldn't turn away. As it sunk in and I realized something very real was happening, I ran all the way out to the barn to get my dad who was out feeding animals. I remember the news anchors being calm at first, saying that they don't quite know what the situation was and why it crashed, it seemed like it still could've been a accident.
I remember they had life footage, but there must've been a lag between the screen the news anchors saw, and what was being aired because I remember her face, when it sank, moments before the second plane came into view and crashed on the footage I could see.
We definitely watched the tv too long. I had an hour bus ride in the morning despite the school being a 10 min drive away (first on, first off) so I knew it was big when I got a ride to school. I remember every teacher telling us that we are just gunna be watching the news that day, and we did. Even as a whole school full of 7/8th graders, that was a quiet, joke free, ominous day.