Why am i getting my wisdom teeth at such a young age?

im 16 yrs old and already have all 4, every doctor says this is odd and not normal for someone so young since 18-22 is normal development of them. im getting them pulled in a month im not too scared since i had 4 teeth pulled at once for my braces but" do you know what might of onset such early growth considering its not hereditary ",with my dad getting his at 25 and my mom at 27 (they never got them pulled either) but my gums hurt so i am..