I could've written a lot of your post. Except it wasn't jealousy I burned out on, it was just futility. I knew going into it that I was never going to be a national caliber athlete, but I reached a point where I'd have to train like a national caliber athlete if I was going to get any faster. My life was work and training. It just stopped being fun. I didn't ride for twelve years.
What got me back into it was a Women's Quest retreat. It was the Northern California wine country retreat I did, actually. They're not cheap, but it was an amazingly wonderful experience that I'd recommend to anyone with the budget to afford it. One of the many things I came home with was the desire to get back on my bike. I'd finally been away from it long enough. And got reintroduced to it in an environment where any stupid voices in my head could get confronted right away.
I think you've gotten a lot of great suggestions (as usual around here!).
Speed comes from what you put behind you. - Judi Ketteler