Help! My Hair DOESN'T grow!?

Okay, I know that all hair grows. You don't have to tell me. But my hair grows incredibly slowly, and my nails grow like weeds. This makes NO sense!! When your nails grow, your hair grows in effect, since they are both dead protien. Is too much protein going to my nails, and not enough to my hair? If so, how can I fix it? I'd love to have long hair. I take a daily vitamin and use hair masks and don't dye it. I have an all natural shampoo and conditioner and only wash my hair every other day. I don't straighten my hair but blow dry it five days a week on low with a wide-toothed comb. It seems I'm doing everything I can to make my hair grow, but it. Just. Won't!