"I am still learning."
     - Michelangelo 

Even when he had spent his life creating masterpieces, he still believed he had more to learn, and more room to improve.

Even if you think you aren't the best author right now, you can always improve and get better. Because even the most masterful of those in a craft know that there is ALWAYS room to improve.

Don't give up. Don't panic. Keep writing and writing because you can and will be great.