Late spell?

Im 13 and i don't have my length. Is something wrong with me?Late spell?
My friend get her first period when she be almost 14. She was totally athletic and active. If you are too, that's why it's stunting it. But not to verbs...eventually you will get it.
I forgot, the single reason why she have gotten her period be because she had have knee surgery and have been immobile.
nothing is wrong you won't be regular for a year anyway=not to verbs
most likely no, zilch is wrong with you. Some times girls dont start untill they are almost 14 yrs. antediluvian.