ISFP suits you. Even ISFJ maybe. I don't think sociability should negate that, if that's what your thinking.
When Se is at the very.. umm.. central part of the ego, I don't think they would ultimately care whether they're shy, and stop themselves. Young or not. A lot of them could be shy, but still try to make impact in one way or another. I think as kids, they'd still try to find a way to have their needs met.. rather than sit back and let opportunities pass. As they grow up, they would unconsciously gauge what would work for them on these levels. In terms of what causes admiration, what entails style in a generally popular way, best kind of jokes, etc.. Not that they would be all of these things at once, but you'd probably recognize something about them that's concerned with their social placement - and good at it. Some might even be preachy, critical, or give people advice or motivate others on this stuff. You seem more individualistic and relaxed than this. If not mostly unconcerned.
The other thing is how reckless some can be... the kind of person who gravitates towards fun and action, but has inferior Ni (which basically would amount to an overconfidence about outcomes.. until it hits them in the face). ISFPs would make these kind of mistakes too, but I think Fi causes them to be more selective and idiosyncratic, and as they got older, better at projecting outcomes.
I'm going to vote "encompasses all types simultaneously" though. Because that's how I am. I am INTJ atm.
No wait.. I'm ENTP.