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Exercises can help a little, but takes years and can be dangerous if you get to rough.
You can use the ballooning exercises, search the web for penis ballooning. eat healthy fresh fruits and veggies, pistachios have needed zinc and drink water smokes and caffiene like in soda will kill growth down there. Take a good multi vitaman and milti mineral supplement. In other words feed your body so it has what it needs to grow.
Let me also add advice on muscle building if your into that. Alot of young men now have acess to body building products like testosterone boosters, Testosterone creams ect. Nitric oxide boosters to build there muscles. At your age these products can and often do cause penis growth! Also certain herbs like Fenugreek, L-arginine and others will raise testosterone levels a bit wich causes faster growth. i do not recommend them as no one knows the risk Hope this helps