i'm 5'8 3/4" now, i just meassured. Im only 14 as well, its pretty funny, im the 3rd tallest in my grade.
I've also got a pretty big build, i got these broad shoulders and im pretty damned strong, its a bit intimidating to people who dont know me, once they do know me they find me to be more of a gentle giant more then anything.
Nevertheless if you get into a fight with me your going to lose, Green belt in karate here and also i have made up my own tactics for fights in my own style.