Because of your age, you should check around your local area for dance programs at local schools or churches.
I'd recommend that you try out a few classes (group lessons) to see how much you like dancing.
You're going to need the help of an adult (one of your parents, I'd assume) to get to and pay for classes and lessons if you stick with it.
Do you know any other teens your age who dance? If so, talk with them; they'll be your best source of information. Also, if you can find a friend who can be a partner, you'll be way ahead of the game (you'll have someone to practice with and practicing is half the fun).
Check your local USADance Chapter for more information about local schools and teachers
Buffalo NY USA Dance.
Good luck to you.
jj