... Were we all this stupid as teenagers?
"Under the bludgeonings of chance, my head is bloody, but unbowed."
You should try to speak with stalkers. you'd be surprised how many of them are just regular human beings that simply dont know how to start a conversation and are afraid of sounding creepy.
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Applied Science? All science is applied. Eventually.
We were all stalkers as teenagers. You start to fantasize about the opposite sex at a super-high level around the start of puberty and it is just part of our genetics in the human species.
Most of us had little crushes before puberty, but not until that stage of life do your hormones scream, REPRODUCE REPRODUCE REPRODUCE. It can be a long variation, from 10-14 for girls, and 12-15 for boys. I personally hit puberty (ability to reproduce) at 13 1/2ish. Voice change, boners, man seed... That's the human stage of life that sends you through a pre-adult life crisis lol.
Within a year I had a full teenager man-voice, and grew 8 inches in a year. I never started getting facial hair until I turned 17 though. Peach fuzz until 20, and then I could grow a goatee, moustache, and sideburns. Not until 25 or so could I finally grow a beard... And for a man, the beard grows thicker and thicker until death (sort of like ear and nose hair).