The first time, my mother managed to make me shave, I was 18. She had noticed for most of the previous year that I was getting a small amount of hair on my face, and had screamed at me about it on several occasions. It took nearly two weeks for my face to feel comfortably stubbled.
Damn Norwegian hairless genes!
But, if I recall, my first shaving injury wasn't until my fourth or so shave the next year.
Oh, and I too wish I didn't remember being fifteen..