I just regained contact with a boy I knew four years ago, when we were 10/11. At first he didn't remember me, but when he did he described me as 'quiet, tall and a bit chunky'. A very accurate description.
Yes, I was really rather quiet quite often. And I was one of the tallest in my class. That's always the way it's been. And, oh yes, I was fairly chubby. This fat didn't disappear until I was about 13.
Thankfully, nowadays I express my feelings whenever I want to. I'm still tall, but this is good and thankfully I'm a healthy weight now. It's fine buying adult clothes when you're 15; not so much when you're 10 because you're too big for children's clothes.