I'm going to sub-skeet this because I don't have the strength or inclination to get into it with...strangers.
Copying is part of the creative process. Many creatives start by emulating their influences. You grow out of it.
Fanfic can be a part of that, or its own thing, or both.
Lighten up.
Some of my earliest writing was Doctor Who and Boba Fett fanfic. Plus an "original" sci-fi novel that cribbed from just about everything I'd been exposed to at the time.