You have to be careful about 3. Threes are the types that question their type the most; because profiles describe people who cant have anything lower than PhD before 23, and who are incredibly narcissistic, and because 3-ish attitude is so well accepted that you think "oh, the fact that i am image conscious doesnt prove anything, everybody is". Yes, everybody is because of culture, not ever Hollywood celeb is a Three, but many many are, that is what they ask for you.
Also a thing to be careful is that if you are a 3, YOU will relate to ALL OTHER TYPES IF you wish to relate. If you think it'd LOOK cool to be a 7, you will take over some 7's characteristics, if you think 5s are so wise you will take over 5, it happens so unconsciously that most 3s spend their whole lives living in roles and not avare of it. It's typical 3.
What I am saying here is what King-of-Despair realized in his own example while he was posting here, you can browse his posts, he was between 7,5,9,7,5,3,7 switching back and forth and I told him immediately he is a 3, because he vibes this way, months later he said he thought he is a 7 because he values some of seven's attitude so tried to take over that, but realized he is only 3, not a mix.
And if someone even remotely relates to taking over something as their own identity - he is very likely a Three.
All people are to a degree image conscious and take over roles because that's requiered in world, you have you business self, your private self, but 3s do it much more and much better, and they cant not do it (unless they are no longer fixated).