Open Question: Am I too big to be a jockey?

Hi :) I'm 14 and a half and I am 5'6. I weigh around 8 stone but our scales are dodgy- a bit on the heavy side xD Would I be too tall/fat? If I'm not too tall, I'm worried that I will get too tall x] My feet haven't grown since february though so maybe thats a sign that I'm slowing down?? lol. If I am too big, whats the maximum size for an excercise rider? I'd like to work with horses but cant afford my own :P Thanks for any answers :D