What age will I start to produce sperm or ejeculate?

I'm 12 will be13 June 23 2011 nd I have grown pubic hair I have peach fuzz thts it there bumb lk hairs comeing out but nothing does I try nd masterbate but nothing comes out I pull the skin back a little nd I see white stuff is that sperm or what any answers would help

Thnk you
 
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