You are good enough! Your stories matter! You are a writer! Just as you are!
So write what makes you happy, and write because it makes you happy. Writing isn't about fame or fortune (because Lord knows there's little of it to be found). It's about the storytelling, the passion and the drive.
So write because you can't help it, because you can't ignore your desire to tell stories. Because that is what defines you. That is what makes you a writer. When you make manifest your stories by putting the pen on the page.
It really is as simple as that. If you're writing, you're a writer.
So go get those words, my friend!