IM only 5,9

I'm Filipino but I'm part Spanish and Chinese my father is 1/4 Spanish and my grandmother my moms side is 1/4 Chinese as for height as of right now im 15 and im barely 5,9 without shoes and socks and 5,10 with shoes and socks. My brother is 5,9.5 at 21 im scared I wont reach 6ft