How To Be Less Approachable

Something about me invites random people to start conversations. Someone, please tell me what it is so that I can NOT do it anymore, at least when it's convenient.

Yesterday on my way to work, I turned the corner at 49th & 8th, and a guy in a bright yellow jacket starts talking to me about how cold it is. He's walking in the same direction. I walk faster, to no avail. It's cold and I don't feel like walking an extra block out of my way. He introduces himself as . I say "nice to meet you, I'm going this way" and cross the street, hoping he doesn't know I work in that building.

Who says New Yorkers aren't friendly? And why are people who talk to random people on the street NEVER cute? I have friends I can hook up!