Why am I experiencing this pain in my legs?

Hey, I'm a 17 year old guy and like 2 days ago my leg began to feel this sort of strange pain in my femur first, now more my fibula and tibia. Not like I am being hit by a baseball bat, but sort of a contant pain that I might relate to a headache, but isn't like a headache. I've never felt this feeling before and I am wondering what it is. I am pretty healthy, I bike quite a bit and such, but I don't understand why I am feeling this pain. I don't really eat unhealthy foods either. Please help. :/