Started going grey at 12

I started going grey at the age of 12. Just white hairs appearing randomly and stuff, over the years more and more have appeared. I am 17 now and it is worse than ever. Not awful but just random white hairs all over the place.

Why is this? Anyone else started going white so young? I can't get a great picture. They're all over the place. Dying them just doesnt work, because more just appear, it has had a big effect on my self esteem