I had the "double whammy" growing up. Not only was I a late bloomer, but my birthday is late December so my parents had the choice of sending me to school early, or waiting until the following year. Naturally, they chose early, so I was a late-bloomer that was also quite a bit younger than most of my classmates. I graduated HS at 17 when most of my classmates were already 18.
I was teased relentlessly in the communal showers in gym class, swim team, and those inevitable JO parties horny teenage boys get involved in. As I recall I didn't really come into my own until about the middle of college at around 20 YO. I was even a bit shy around women at first, fearing that they'd mock me once they stuck their hand down my pants and found a "chapstick". Got over that pretty quick though, first time a girl stuck her hand down my pants!!