Most succesful writers are literally maniacs who went from bad to excellent
Some things I like to think about in the moment of discouragement.
JK Rowling said every new writer has to write rubbish "out of their system" until they get sufficient skill. The first Harry Potter had 11 drafts.
First draft of The Name of the Wind was "a hot mess" according to author, and he had to spend over a DECADE to perfect it. GRMM said he wished he wrote that.
Brandon Sanderson wrote 14 (!) novels before he wrote the one worthy of publishing. He said his first books were terrible. But his insane work ethic drove him to be one of the most productive and highest rated authors of all time.
Stephen King wrote every day for hours, and still , when he wrote his debut Carrie, he wanted to abandon it. It was published thanks to his wife, who pushed him to stick to it.
George RR Martin had been working on The Saga since 1971. But he said one has to start with years of practice with shorter stories until "climbing" the Mt. Everest.
All of these authors were rejected A LOT.
If you feel like you are terrible, which happens to all writers, keep at it. These guys did. Now we have Harry Potter, Way of Kings, Game of Thrones and other great ones.

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