Im 17 and 5'11 will i grow to 6'3 my relatives on my dads side are above 5'11.
There is a possibility that you might grow to a height of 6' 3 depending with how tall your parents are. To predict your height you can use an online tool like http://www.theheightpredictor.com/.
If you are male, you can keep growing taller until about 22-25 yrs old. Girls only grow taller for about 5 yrs after they start having periods.
You're lucky kid but one question boy or girl??? And yet no one can tell the future on how tall you will grow up to be.