I know. It's really hard to delete those words that took like two hours to compose. But you have to get over it; it's the first step in editing.
Flaubert was a fantastic French writer in the 19th century who would agonize over finding the perfect single word. . . for days. He didn't bother vomiting all his thoughts on paper before paring them down, he just started with a solid foundation to build on.
We aren't all Flauberts out there, unfortunately. But the secret to a polished final draft is the editing; the end result in most cases will be a pretty skinny version to the original. But skinny seems to be fashionable these days, no?