You have to be 18 to use the Forum.
Now go do your homework!
As a parting note, school clubs and activities are a good way to meet people with interests similar to yours. Local recreation or special interest groups are another method. Charities (like Habitat for Humanity) or other volunteer groups might be good for you as well.
Go to the reference desk at your local library and they can help you find groups of kids your age.
Good luck!