That's a good way to look at it, I believe. Though I'm pretty self-conscious about my own work too, rarely, if ever, sharing things with others. Lately, I have been working on a comic, managing to create 45 pages before running into writers block (dammit). I haven't shared this one with people yet, well, bar my brother anyway, but even he's only seen bits and pieces of it. The purpose of this project was to prove that I too, can be original in my creations. But that might not be entirely possible (like others have said, and I definitely agree) I also tend to work off the ideas of others whilst changing something up A LOT. Whether I put my own spin on it, or just flat out attempt to improve it and make it better. All in all, I am very easy to inspire when focused.
I was also a bit smarter when it came to handling this project. Every time an idea hit my head, I jotted it down (as well as summarize what I've done so far) in what's now a very sizable wordpad document, which is good so I can always go back and reference it later. (Trust me, folks. Jotting down ideas as soon as you think them up helps. It will also help to plan out as much as possible first. If you don't, then you're likely ensuring your project's destruction. A painful lesson I learned the HARD way.) I know I'm not done, as I'm sure I'll pick up that pencil and paper again, I just need to find that 'drive' I had a few weeks ago. As for what's going to trigger that, I can't really say. What a pain.