You're young and likely still growing. I wouldn't rush things. If you want to run 100 mpw, fine, go for it, but I'm not going to recommend it, not at your age. The risk/reward tradeoff is too great. Build up to it over time. I don't care that "the Kenyans run this kind of mileage at the same age." I don't know what you've run previously, but 40-60 mpw is plenty right now. You don't need to be doing 20 mile long runs. As a junior, 60-80, maybe. 80-100 as a senior, though I would err on the low side, and keep the development going straight through college. With even a modicum of talent, if you stay injury free, you should be under 30:00.
I always liked the advice I got from an old school track coach but never took heading into my senior year: "Run the 1000-mile summer." That's anywhere from 75-80 mpw depending on how it's structured. If you want to run a 100 mile week for grins, do it. Then back down. That's my advice. You are correct to want to focus on aerobic development, but there's a fine line. Some guys can get away with it.