Yes, you are too young. Witchcraft is something you are free to read about, but you can't decide until you are older if it is something you should pursue.
If you are serious about it, then you should learn all you can about nature, the seasons and the moon cycles. Study science, especially about planet Earth. Learn the names of the trees and wild plants. Find out about the habitats of animals where you live.
You need a good foundation in these things to become a true witch. Read all you can. When you are seventeen, you can decide if you are a true witch. Good luck.