[theantihero]

No. No, this is not normal. It is not right that you, as a thirteen year old, to share the same bed as your step-brother. Is he younger or older? It doesn't matter what his age is, your father and step-mother should be making room for you to have your own bed and he his. This sounds like some convoluted story that's come off the darker side of the Internet. I would seriously sit down with your mother and discuss this with her because no, this is not normal and this should not be condoned in any situation.