How to make my hair grow longer, faster?

About a year, maybe even two, ago I had LONG hair but for some reason I cut it to my shoulders. I am 14 now and its only like 4 inches longer than when I got it cut a year ago. I get my hair trimmed regularly though. I've read that exercise and healthy foods help hair growth. I am in a strength && conditioning class for school that I go to every morning at 6 so the exercise part is covered but I love junk food. I have a high matabalism (sp?) so I only weigh about 105 and I can eat all the junk food I want. I want to know what kinds of food to get (fruits, veggies, meat) But I HATE fish so don't worry about putting that. I have vitamin e pills and prenatal vitamins that i've heard help keep nutrients in your body. I want to know which one works best for healthy hair. I haven't been taking any cause I keep forgetting but I don't want to take both, only one. So the questions I need answered are "Which kinds of food should I get for healthy hair?" && "Which pill is best for healthy hair, vitamin e or prenatal.?"