Is four feet eleven the normal height for an 11 year old girl?

4'11 (59 inches) at 14 puts you at the 5th centile for your age. This means that out of a room full of 100 randomly selected girls, 95 girls will be taller than you. The 50th centile would be 63 inches.

You would need to plot your heights over the past few years to see if you have always been on the 5th percentile before making any more inferences.