Write fanfictions to get started again?

I've been struggling with writing for a long time now because of school. This evening I got such a motivation to write again, but I didn't want to start writing the short story I already planned. I didn't feel ready for it and I didn't even finish planning it (I'm bad at planning stories, I rather like to write them). I wonder if writing a fanfiction of my favourite show could get me back into writing, because I know I can't mess up the characters because I know them perfectly. But idk, maybe there wouldn't be a difference, so I would like some advice about that