At 15, you've got a very good chance of growing taller. My son had a growth spurt at 16 and another at 18. I'm 5' 11" and his mother 5' 6". He stopped growing at about 6' 3".
Usually you're the same height as your grandpa and uncles and males stop growing at a later age, unlike females who stop growing when they're around 15-16. You will still grow, little by little. I'm 17 and around 5'8 or 5'9 and taller than my dad. Same height as uncles and my grandpa was pretty tall.
