Tis better to have wrote and failed, than never to have wrote at all. Lest thou then take yon writing and destroy it in disgust - then, alas, it is as thou hast never written in the first place.
And all that jazz. You're not a writer until you actually write something. Yes, it will be bad, and it will be awful, and you'll hate it and despise it and wish to simply throw it out the window, smash that delete key, and be rid of this affront to your assumed talent forever.
But don't. As hard as it may be to realise, you need to write a thousand bad sentences before you can learn to make decent sentences. And you, of all people, are the least qualified person to make this assumption. You are far too emotionally attached to anything you write to have any sort of constructive comment on it so early in your writing career. So you may hate it, but that doesn't mean it's bad. Doesn't mean it's good, either, but the truth is you're not in a position to judge your own work.
So just shut up, sit down, and write. Cellotape a live scorpion to that Backspace key, and god help you if you give up and start again. You write. You write and write and write and stop listening to yourself and write and write and write. And then, when it's done?
You write more. You are only as good as the next thing you write. Hand off the earlier work to an editor, an enemy, a forum. Forget about it. Come back in a few weeks with fresh eyes and then you can find someone else to edit.