Welcome to "Having a Career"!
Whatever you do, don't quit. Keep at it until you figure yourself out and find a reasonable alternative.
Why not stop by your local community college? They may be able to help you find what interests you.
The problem with chasing dreams is the risk of becoming a starving artist, like my brother. He gave up a good career in medicine to become a musician. Why?
He didn't like his job. Years later, he lives in public housing. (across the country)
Why? because like most things that people "want" to do for a living it usually doesn't pay very well or pays nothing at all 98% of the time.
That top 2% makes all of the money. Just look at American Idol.
Other things that people "like" to do are often the same as the Musician business. The top does great and the vast majority including a lot of very talented people, do poorly.
My advice: If you truly can't stand your career, try to find a well-paying one that is more tolerable while you work on "Plan B".
In other words: You may well end up with something as bad or worse if you want to make decent money.
You should already know your strengths and weaknesses after 20 years on the job. Write them down on a piece of paper. Then try to figure out if you want to add new skills or work with what you've already got. Perhaps it will be more clear on paper.
Good Luck,
Keri
PS. I've been at my truly awful job for 23+ years. Now I'm just counting down time remaining and smile at the sadistic fiends that pass for management nowadays. I've outlasted many, many management teams and might just outlast these ones too.
PPS. The grass really
IS greener on the other side! Why? Because it's
VERY WELL FERTILIZED!