I want to tell you something important: every great writer started where you are now. They didn't wake up one day being perfect. They wrote, they failed, they learned, they grew.
The secret is simple: you have to write. Not just think about writing, not just plan to write - actually write. Every day if possible. Even if it's just a few sentences.
Embrace the Messy First Draft
Your first draft will be bad. That's okay. That's normal. The magic happens in revision. Give yourself permission to write badly at first. You can always fix it later.
I know writers who spend hours staring at blank pages, trying to write the perfect first sentence. Stop that! Just write something. Anything. You can make it better later.
Learn from Criticism
Getting feedback hurts. I'm not going to pretend it doesn't. But feedback is how we grow. When someone critiques your writing, thank them. Then really think about what they said.
Not all criticism is valid, of course. But most of it has a grain of truth. Find that grain and use it to improve.