The honest truth is, at first what you write is crap.
I read stuff I wrote 10 years ago and I can see how pathetic it was.
You get better at something by doing it. By honing your craft. Some of what you write will be garbage. WRITE ANYWAY. Because the more your write the more what you write will be GOOD. Write something everyday. Practice your word craft. Expand your vocabulary.
Never give up!
The best authors didn't sit down one day and write an amazing story.
But if you don't give up on your writing, someday you will.