What to do about an unsupportive family?

I've been developing a show for television for a little under a year and have, with no representation, secured a meeting with Frederator studios(developers of adventure time,fairly oddparents, and chalkzone) soon. My family (including my mother, grandmother, uncle ,and aunt) ignores when I try to tell them about the project due to my young age.

I am 16 and mature far beyond my years. I articulate my self in a manner not commonly used by other teens my age but when it all comes down to it I am still just an insecure teenager and when my family ignores my goals it makes me feel like they are undermining my creative ability which makes me doubt myself. How can't I get them to give me the support I need?