Hey Doc, I'm 16 And The Eldest Of The 3.

Hey doc, I'm 16 and the eldest of the 3. Turning 17 this May. I'm 5'7 and my dad is 6'1. I've been doing many excercises to grow taller etc stretching, soccer & pull up since early of 2015 but still there is no difference. My 15 y/o brother is at the same height as me and I'm worried if I can't grow taller before I'm 18. Is this because puberty didn't hit me yet or there are any other specific reasons?