It's obviously impossible to go an entire year without spending any money. We need to eat, live somewhere, drive to work, have a little fun, etc. The important thing is to decide now what that fun will be and to not deviate from it.
The problem with life is that most fun things are expensive. Although there is plenty of free fun to have, most things cost money. Make sure you aren't completely limiting yourself over the course of the year so you enjoy your life a bit!