I was twenty years old and living in my first apartment with two roommates. One was my best friend since junior high, Evan—a big, athletic hulk who played lacrosse and seemed annoyingly good at everything. He was strong, confident, and girls couldn’t get enough of him. I was the complete opposite: short, skinny, and always had been. Our other roommate, John, had moved in a few months earlier. He was cool but rarely home b...