I'm raging at what was probably a child
What did a child do to make you so angry?
He cut me off the road, I'm angry at him!
It was probably not a child that cut you off on the road. Being upset a being cut off is normal, but it is better for your safety to forgive and forget.
My anger should color everyone's life. It's my right to be angry.
You do have a right to be angry. But while you are driving it is better to keep your emotions in check. Being angry while driving can impair your decisions and your driving.