alien in the woods

I was seven years old. Lived on Whidbey  Island.  My brother and I used to play in the woods right behind the elementary school (Oak Harbor Elementary).
On this particular day it was hot and  as we were playing army I lost sight of my brother. So I started running while looking for him.
I remember as I was running I felt like an electrical charge, all of my hair was standing up on my arms and my ears felt funny.  Almost like when you are up high in altitude. I looked to my left and I saw a 12 to 13 inch high humanoid running beside me on a log keeping up, and it turned its head and looked at me. The most horrifying thing was when it smiled. It had a really big mouth with a lot of teeth. It might have been small but I will never forget the terror I felt.
I immediately stopped and turned to run in the opposite direction when I felt something extremely cold, Large, square, hit my back and sent me flying about 10 feet through the air. It knocked me out.
When I woke up, I went home and complained to my dad about my back. I was bruised with a black and blue square mark about half the size of my back. I never told my dad how I got the bruise, but it was so traumatic that to this day I will not go to far into the woods by myself. I always have to be able to see a clear path to my car. I have never gone back to those woods on Whidbey Island. I hope this helps in your quest for knowledge. I do believe something is there. Thank you for your time.
Witness indicates that the date of the sighting is approximate.  PD