You only realize how bad your story is when you look at somebody else's. Everyone's stories are different. Even if theirs is more sophisticated, uses better vocabulary, or even just is more popular. You are making a one of a kind masterpiece. Nobody has wrote the same book as you. Your errors just make it even more unique, which is what people, writer and reader, enjoy.
I never truly understood why it's so difficult to start a book until I tried myself. It's not because all the good ideas are taken. It's because there are too many good idea to choose from.
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