It's not an adrenaline thing; I'd never throw myself out of an airplane nor want to drive a vehicle over 80 mph. I guess it's more like solving some analytical puzzle. For example, I'd much rather be dropped in a foreign train station without my bearings and with no one with whom I could ask in English. I am hooked on the need to figure out things on the fly.
The goal of many, probably the majority, is to settle. That might mean to take root and become part of a community. I've always noticed the negative aspects of that verb, though. I don't think of it as being anchored, but a bit more like giving up on something potentially better.
After all these years, I've stopped thinking of my situation as a problem. Now, I wholeheartedly embrace these tendencies. I feel so much happier exploring. I like being removed from nearly everything familiar. Are there examples of animals which die when caged? That would be me without the promise of someplace new on my horizon. Thankfully, I found a partner who matches and perhaps surpasses me on this front.
This need can be met in very small ways too. Today, for example, I needed a haircut. Having to find a barber is hardly stuff that changes the world, but it did make life interesting, and ultimately more rewarding.