There are no guarantees here so don't count on anything you hear here but you remind me of me. My Dad was same as yours but Mom was an inch smaller and I was exactly like you at 15 and when I played pro football I was 6ft 4in and 220 lbs solid and in fact my parents had 3 boys, all over 6 ft . Unfortunately at 61 now, I've shrunken to 6ft 3in and around 230 but not so solid anymore LOL.
So youll know for sure in the next two years but always remember this; the measurement of a big man is not measured by his size but how low he can stoop to help a child in need. Good luck my young friend