When I was in high school, periods were still fairly taboo, and no one really talked about them outside of health class.
Need a tampon? Discreetly pass a note to your friend in class and pray they have something in their backpack. Leakage ruining your day and your pants? Tie that sweater around your waist and pretend it's a new look you're trying out.
Thankfully, teens today are much braver than I was in so many different ways, and they're taking a stand against people who try to make them feel ashamed for something that is totally natural and quite literally beyond their control.