I identify with this 100 f**king percent.I'm a sensation seeking INFJ (woman). I've always had a fascination for physical challenges. And fast rides. And traveling. I didn't try those things out as readily when I was younger, but I was hyper aware of my attraction to such things. I know the way I can be surprises people.
I genuinely prefer to be kind and polite for the most part but I can't stand when someone mistakes kindness for weakness. I've had people think I'm a pushover and they get a very rude shock if they try to walk on me or mine. I admit that it annoys me greatly when anyone presumes that I'm a shy retirer because of the type I identify with. If I think about some of the INFJs on the board, they seem some of the most adventurous, accomplished people, just a bit more under the radar about it.
If my experience is anything to go by, I suspect INFJs have a strange relationship with our own ability to be powerful or with people thinking we aren't. It's like a snake in the grass sometimes, darting out unexpectedly and sinking it's teeth in. I don't think an INFJ has the kind of control an ESTP might over those flashes. Even the way I'm describing it is far more self-conscious than an ESTP might describe the way they flex their persona. I think it's because an INFJ IS self-conscious about such things, there's a lot of thought that precedes anything we do.
I notice that the baby ESTP comes out to play with a vengeance when I've been feeling too intensely in a way that is burdensome. When I feel like I've been at the mercy of my feelings or a situation, something flips inside and then I just cannot care at all for a little while. I need to blow off emotional steam. It's better if I don't let myself ricochet back and forth between those states. It doesn't happen as much if I'm engaging in regular, fun, physical activity.
My parents were both ESPs and performers as well, so I'm sure that has a lot to do with it. I don't crave attention though, if, in fact, ESTPs do. My ESTP father and I have a strange mobius strip reflection of each other going on... I'm the one rolling eyes at his level of consideration of others now, (esp in traffic!)
I'd never be mistaken for an ESTP if someone were really watching me though. (I did walk the Bay-To-Breakers in little more than my underwear recently, but my partner in crime and I did it in quite an ice-princess-y/classy manner of course. :p ) It's a matter of frequency. I go out one night and shock my E friends with my level of energy but then I'll need to go curl up in a ball for the next week, or two, or three.
Also, I kinda like when I'm in the middle of fighting for something that's important to me or someone I care about. And it's almost like the messier the better. Makes me feel like I can do anything when I'm engaged in those situations.
I don't think anything I've described above is at all uncommon for INFJs.