Answer:
I belong to you but others use me more often than you do. What am I?
I am a daily ritual involving using a metal tool on the body
I can sizzle like bacon. I am made from an egg. I have plenty of backbone but lack a good leg. I peel layers like onions but still remain whole. I can be long like a flagpole yet fit in a hole.
I am needed for most animals and hardcover books
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?