Okay so today?? I grabbed the Basketball Rim?

I'm 5"9 and 14 and I grabbed 9"10 rim. But it hurt my arm I think I stretched my muscle in my fore arm!! It's really painful, it's first time I hang on it, I only hanged for like half a second! Why does it hurt??

Also how can I jump higher I wanna dunk by 9 grade of next year!!
 
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