Extraverts do need time by themselves too and do get worn out when going out too much - if you go out with people, usually you do something like staying up late, talking a lot or something (all of which are physically tiring as well), and the brain can only have so much stimulation before it needs to cool off. It's like if I've been by myself for a long time, I feel the need to see people, but I don't get energy from them - I just need the change of pace. If you feel less comfortable around your family, maybe you've got used to having a lot of privacy so you still feel the 'need' for it.
That sounds like a healthy function no longer being repressed, I think. Usually, repressing yourself makes you feel tired/unhappy/anxious etc. whereas being yourself makes you feel peaceful/content/happy etc. Impulsive could be another function working (not sure what though...).
There's a confusing description of Ne, that makes it sound like Se (although as an ISFJ you'd use Si, so it'd be difficult to confuse Ne and Si, unless one was a shadow function), but basically it states you're connected to your environment to discover possibilities. From your posts, it does seem like you explore possibilities in a way that's not thoroughly connected to the physical world, but is derived from it. Now, it's hard to say that, if it is Ne, you're using it as a shadow function or as a repressed dominant function. That would be something only you could know.
It seems like you looked at it more objectively then, or maybe it was low self-esteem - feeling that you deserved them being like that because you weren't on the same level/as good as them or something? I couldn't say how you felt about it, so it would depend on what your motivation was for thinking that.
You could have rationalised it by thinking 'I'm the youngest, so they must know better than me' or something like that.
A lot of kids would have spoken up about how they felt left out, or made a fuss over it, so maybe you were repressing yourself with it? I know a heck of a lot of people that, as kids, would have left the table anyway, or got pretty angry.
Personally, as I repressed myself a lot as a child, I can relate to that - I used to put up with stuff I didn't have to, because I was too scared of being called out/criticised or just having any kind of comment made on it - that was a product of low confidence and bad self-esteem.
It sounds like you're repressing yourself quite a bit, and maybe now you're letting yourself relax more (on your own at university, independent etc.) you're starting to stop repressing? I found I felt very anxious for ages when I repressed anger - I got sick, had eczema etc. because of the stress of repressing and, when I stopped, I felt much better and the physical symptoms stopped.
By the way, here's a good description of Ne on a good website (courtesy of @
tine ) which might help :)
Understanding the MBTI Test
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