Why do I crave salt so much?

I always crave salty foods, I don't like sweet foods, only occassionally, and that's if I'm starving. Alot of the time I just won't feel like eating something if it isn't salty/seasoned. I've sprinkled salt on my palm before and just ate it that way. Could it be because my mom thinks I'm anemic? I'm very pale and have very dark undereyes. Alot of people have asked me if I do drugs, and even laughed when they insinuated I did and I told them I didn't. I've gotten called a zombie...I'm always told I look tired. I get tons of sleep. What can these symptoms be?