I have white hairs at 19 years old. What should I do?

I am a 19 year old girl and have a good number of white hairs. We started noticing the white hairs a year ago but now they are more abundant. I have asked my whole family and no one has had any white hair this early. I think it may be connected to vitamin B12 deficiency anemia because I had some of the symptoms before my gynecologist prescribed me birth control pills for my heavy periods. I am looking for some form of treatment other than hair dye. I have looked up pills like Reminex, Melancor, and vitamin B12 supplements but am not sure what I should buy. What should I do?