I was really short at 13.[currently 15.]
But I did take a growth spurt and now I'm taller than my mum.[but not taller than my 12 year old brother.e-e]
You will most definitely grow more.
But what also helps is stretching.
I recommend stretching every morning when you wake up, and every night before bed..and randomly throughout the day.

I read somewhere that if your muscles grow, your bones kinda have to, so your body does one--of many-- amazing magic tricks and you grow.
It worked for me.:3
I grew a few centimeters in like...4 weeks..[it was awhile ago when I did it. I think I was your age.xD idfkitwas7thgrade]

Btw~ I *LOVE* your siggy.:3
SHINee Hwaiting!^o^

o 3o