My advice is going to sound an awful lot like everyone else's. First: Finish it. Whatever it is you're working on, stop tweaking that first page and actually write a complete product. THEN you can tweak. But a completed thing, no matter how shabby, is better than half a thing, because in practical terms, half a thing is nothing. Second: Show it to other people. There's no room for shyness, here. You must get out of your echo chamber and seek other people's opinions. If they tear your work to pieces, that's a good thing. Analyze their advice and use it to decide how to make your shabby completed product better. Third: Stop romanticizing it. The mystical part happened when your initial idea came to you. It's over and done with. Turning that mystical inspiration into a story is work, not magic. It can absolutely be fun. It can transport you to a world of your own making and all that jazz. But it's still work, something you have to make yourself do even when you don't feel the muse stirring. Waiting for the muse is just a mask for procrastination, and that's why you're still aspiring. The fastest way to quit aspiring is to start doing.