This happened a few days ago. While “attempting” to help my cousin cut a piece of wood with the help of a small bow saw, I gave up after doing it for a few seconds because I wasn’t too great at it. But that’s not the important part.

I actually managed to hit the back of my head while getting up. But it didn’t hurt extremely hard. Now I’m unaware whether or not I have suffered any concussive or sub-concussive brain injury from doing so. What I’d like to know is whether or not I suffered any kind of brain damage from the hit.
Is it possible for the hit to have killed any brain cell?