Just a quick note -- I started writing 7 years ago. I was deeply proud of my first manuscript, but it went nowhere (and now, six years later, I totally get why). My second manuscript was nary any better, but my third was pretty good. Even so, it didn't fly with agents and neither did my fourth.
But my fifth, did. I landed an agent on a query I workshopped here at AQC. My agent and I revised it furiously together and then it went out on submission -- where it landed with a thud.
But we kept at it and after several false starts (and one rejection from an acquisitions team -- that hurt), it found a home with a phenomenal editor at a great house.
Keep working, keep writing, keep hoping, and it may happen for you, too.