Thank you three for replying! I really appreciate the thoughtfulness and varied perspectives!
Putting my problems into words and seeing the responses has really helped me realize some things.
-The main thing is that I think my dreams have changed, and I need to accept that it doesn't mean failure to change course. I used to want to be the next Horowitz. Now I want to make a decent living doing something I enjoy, be active in my hobbies and volunteer work, and have a family.
-My days of spending six hours in the practice room are over. I don't want to live that way anymore! That means there's a limit to how much I can improve my technique. Right now I just have the time and energy to practice enough to stay on top of my accompaniments.
-There may be such a thing as "good enough," something I've never been comfortable with! I do a good job accompanying, even though I'm not a competition winner.
Sly - you're so right, I think part of me was indignant that all those years of dedication didn't pay off exactly the way I wished. Tough! Your post helped me realize that being a spectacular pianist is not something I want badly enough anymore to do what's necessary. I can't have it both ways, and there's no use feeling indignant about how things have turned out.
whynot - Yes, I have tried to instill in my students some of the important values that were omitted in my training. Actually, they are more about musicianship than piano technique. Having to sightread scores and learn lots of accompaniments has been very difficult because fluency wasn't emphasized enough in my training. I guess it depends on what kind of path you want to take: accompanist/teacher, or competition hopeful. Anyway, the fact remains that I don't want to continue spending so many hours of my life teaching. You were right that it would be something worthwhile to do, while I worked on my playing. That totally helped me realize how I've passed the stage where I'll do anything to be a better pianist. I guess it's weird on a piano forum for someone to post and then realize they don't want to be a pianist anymore, but there it is!
Jenni - It's definitely not something I felt prepared for by my teachers or by my music school. I do think it's a real difficulty for solo pianists in particular. (Other instrumentalists are trained all along to do ensemble playing, and more accurately experience a prelude to real life. Learning and polishing to death four mammoth solo pieces a season doesn't prepare a pianist for being a piano teacher, accompanist, and organizing your own infrequent recitals on the side!) You may really enjoy teaching and accompanying, who knows? For me, the self-involved parents, students enrolled in every extra-curricular activity known to man, and hassles of being self-employed are outweighing the positive side. However, it has its deeply rewarding aspects as well - I don't want to be only negative about it! So much can happen though, between now and when you graduate - you'll find your path. If you're willing to make changes, you'll always be okay.