After all, contests are how Intentional Winning was conceived! Photo contests are one way to not only figure out what your point of view is, but also to practice and let other people see your work.
There are thousands of contests out there but one that I like is the Costco Photography Contest. You do have to be a member of Costco, but there are many, many other contests that are free to enter as is this one if you are a member.
Contests on local levels will be easier to win or place in than national or international contests, but i say put your photos out there! You can't win if you don't enter!