Are you lying of your height?

hi i am 17 and 6 feet 6 inches tall, i wanted to know if that height is really as scarce as it sounds because the avergae american height is supposed to be 5'10, it doesn't seem like that anymore because i read some comments online and people are claiming that thry 6foot 7, 6 foot 10, 6 fooot 8 6 foot 5, arent these heights supposed to be like really scarce? i dont get it, confused.....