Your opinion on these times?

I'm in eighth grade. A month and a half ago I joined track without any prior sprint training. I would love to be in the Olympics for 100m dashes and its my dream. At 13 years old I ngot a time of 12.17 in the 100m. I think its okay, but what are your opinions? I also don't have much muscle in my legs, I'm carrying around a bit of extra weight, and have never ran track before. I'm going to special training this summer. Do you think I could make it to Rio 2016?