Answer:
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around. What am I?
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
I had a bright start but I couldn't take the pressure. I consume everything yet I don't eat anything.
I am drawn by everyone without pen or pencil
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?