My sister and our friend, we all used to LARP and I would end up being the story creator. But then when it was our friend's turn to story create she'd do exactly what I had done. It got really annoying, and at the beginning I went along with it, but one day I got so fed up I confronted her about it. She admitted to having done similar things, but that's because she couldn't really think of something on her own. Same with my sister. So from then on I was the story maker.
Copying me in other things, no nobody has ever done that to me. Like copying my life. How I would deal with it though, is I would confront them and tell them to stop. If they feign ignorance than I would continue to interrogate them until the case is closed.