Are ENTPs very opinionated and close-minded when they are young/immature? I have a friend who seems to hate a lot of things without ever giving them a chance. She told me she hated oatmeal one time. I made some this weekend and she admitted that she had never actually tried it. We got her to take a bite, and before she could even really taste it, she confirmed that she did, in fact, still hate it. She does this with a lot of things, and I don't think she does it to mess with people.
I remember being like this when I was younger. I was very picky about food, clothes, music, movies, etc, but I mostly grew out of it by becoming a more balanced INTJ and am willing to try just about anything nowadays. Is being extremely critical and close-minded to change just an immature NT thing? I guess I thought that the P in ENTP would make my friend more open to new things. What's the deal?
I'm willing to try anything once, unless I get a physically aversive reaction to it - I'm very sensitive to smell, so, I have issues with fish. Also, I cannot eat a lot of preparations of chicken, especially if it's not fresh, and not white meat, because it smells to me, and the smell stay on the bones

. I also don't like milk because it has a pungent smell to it, and some kinds of cheese.
I am sometimes picky about textures of food too (it might be the same for your friend, with the oatmeal), in that, it literally won't go down my throat, even if I'm trying to force myself to swallow.
When I was little, each meal took approximately 2 hours for me to finish, even when my mom was helping me eat. She says, it took an average of 7 stories [stretched out with many side-bars], per meal.
I do remember, though, having a stint where I intensely disliked raisins
I also dislike raisins because they're dead, shriveled grapes, and look kind of like mice droppings. I do not like celery because it smells like cat piss to me. I do not like fresh corriander leaves because it smells like Indian cat piss to me. I do not like zucchini because it's a wannabe-cucumber. When offered in food to me, I politely tell people I am violently allergic to all of the above (this is not true, but it's easier then entering a dialogue of "but why? Try it, just once..." etc, etc).
Can I have examples of your extroversion? Does it come across more as socializing with people or is it more about putting your ideas "out there"?
Sometimes it is manifested as socializing with people, but, I'm not really a social person. I can be, and I'm pretty good in social situations, at engaging in, and/or directing conversations, but I much rather soak everything in [this is how my extroversion really manifests, with curiosity in everything that's going on around me, the dynamics going on around me, sans my influence]. I just get energized deciphering patterns/cause-effect in the world around me, in any aspect of the world (human or otherwise). One-on-One is where I am more naturally social, while in a group (unless with close friends), in some ways, I feel as if I'm playing a part, and there is definitely a level of mental exhaustion (keeping up the "Fe").
I definitely like to bounce ideas off of people, or muck about with ideas thrown at me, and for that, of course, people are useful. But, I can be just as entertained interacting with an animal, a small child [they're especially fun for the Ne, cuz they can be ridiculously random, which is always

], as with a grown adult. I had a lengthy conversation with a 5 years old, which was utterly entertaining for me, because she had pretty much mauled her doll's face, and when asked why, she said that she was turning her into a robot. So, we pretty much made up this fantasy world where robot dolls would rule and all the superpowers they would have, and their one weakness was broccoli (she hates broccoli), so I said that if robot dolls live in a robot world, then their vegetables would be robots too, and it would be watered by oil. Robot broccoli. Which, to mere humans tastes like broccoli, but those who have the superpower of the robotic world, it tastes like pizza! She requested broccoli that night (much to her mom's surprise), and her and I had a great conspiratorial grin over dinner, while eating our broccoli-pizza.
In the end, I just need external stimulus that gets my mind whizzing [that external stimulus doesn't necessarily have to be another human being].
I also love just going to a place and just watching something unfolding - like how the birds are interacting with their flock to avoid the cat they see roaming about, the calls they make to each other, the pursuit of the cat, its dissatisfaction in itself when its mission failed [a while storyboard is going off in my head, including inputting funny dialogue for the creatures, be they other humans, animals or objects, when I watch such things].