16 years old? Your attempt to escape the school grounds cruelly thwarted by the barbed wire? Torn your trousers (groin area) as you wriggled on the fence, your fellow escapees laughing at you and walking off?
Just pay a visit to your school’s secret-blogging teacher and ask to borrow a pritt stick to glue something in your exercise book. They won't be at all suspicious that you are suddenly taking an interest in your studies!
Then stand in the corner of their classroom and unsubtly try to glue the shredded fabric of your trousers together. When this doesn't work, just try sticking the cloth directly onto your leg - the teacher won't mind one bit when you hand back the pritt stick with stray pubic hair embedded on the end!
The secret-blogging teacher will either be too dumb to notice what you're doing, or too dumbfounded to say anything if they do! And they certainly won't want to tell the world!
As that Gestapo agent says to the gullible British officer in The Great Escape, 'Good luck!'