My first bicycle was not, in fact, a bicycle. I rode it in 1968, when I was two years old and as tubby as a bear cub. It had four wheels, not two, and no pedals: strictly speaking, it was a scooter.
Bike commuting is healthier and more environmentally friendly than driving and faster than walking, and, over time, it will save you a lot on MetroCards (if not stop you entirely from buying them).