Yes, well, I relate to this but here's a piece of advice: Don't get rid of it. Create a new document or begin again on a separate page. You're never going to like your first draft. Or your second. Just keep writing. Never get rid of the drafts, and always keep writing. In your eyes, it may never be perfect. Shoot for the moon. Even if you miss, you'll land among the stars. Trust me. The moon is harder to reach than it sounds.