she 'd already spent the first half of her seventh-grade year at saint bartolomeo school-the part after the screening of the your body is changing : womanhood video-puzzled by all the changes they did n't list , like uncontrolled bursts of speed and randomly crushing objects you were just trying to pick up and hitting your head on the ceiling of the gym when you were doing jumping jacks and suddenly being able to see dust particles on people 's clothes .