[angdis]

I have some similarities with you. 8 full-time jobs in 15 years all after a 9 year stint in graduate school where I quit a PHD program. I also crave trying new things even when they're risky, much to the horror of the people I work with (I'm in manufacturing, so I deal with operations and supply-chain people everyday).

You cannot "cure" what you find motivating. Just learn to live with it and perhaps force yourself to take longer "tours of duty" in jobs. Consecutive jobs held less than 1 year is universally considered a red flag by employers, as is getting fired. Engagements lasting 2 years in fast-paced industries are generally OK. If you're good at what you do you can probably control your urge to quit for a bit longer and do enough to not get fired. 2 years is not a long time and if you're able to do other things besides work, it can be a great advantage to have a job while exploring new things.

Another thing to consider is your life outside of work and your relationships with family or a significant other. If you're defining yourself strictly through work and ignoring the role you play in the lives of others, you're going experience some profound disappointments. In other words, perhaps your career decisions aren't really the root cause of your turmoil-- perhaps it is something far more personal? In that case nothing you do related to work will resolve your issues. YMMV-- just a thought to consider.