Finding work as a movie/tv extra?

I'm 15 and I absolutely adore acting, and no matter how many times my mom tells me how difficult it is and I am willing to do anything. I will work my butt off and wont stop until i become a movie star. I'm thinking about starting small and working my way up beginning with being an extra. I have some interesting talents, I'm very good at impersonations and I'm not joking when i say that i can do a spot on impression of Cat Valentine from Victorious I sound just like her, I'm serious (I'm trying to post a video on Youtube of me doing it but I'm waiting to get a professional camera rather than using my computer to record it) i can also do a very good Peter Griffin impression despite me being female. I can also sing like Demi Lovato for some weird reason. I don't want to look like I'm bragging cause thats opposite of what I'm trying to do, I'm just hoping that this helps me get somewhere. So if anyone could tell me some websites that are hiring extras for movies or t.v shows that are actually real and are updated often that would be great! please nothing Disney or little kiddie. by the way i live in Florida so anything close to orlando would be awesome, Thank you!