I don't have all of life's answers, but I'm going to go out on a limb and say that 99 times out of 100, you (INFP) are not going to morph into someone that behaves, acts, and thinks like an ESTJ. If you look back to when you were a child, you were probably different than others in a lot ways. Your personality was beginning to take shape. As you get older, that personality is probably going to become more of an identity of who you are, because you will have figured out what you like, what you don't like, etc. You'll be more "sure" of who you are as a person, you'll have more of a foundation. Someone who is young and more immature is more able to be "molded" or changed by the advice of a friend or by social/peer pressures. Once you know who you are, these things *can* still be valuable, but they often times have less of an influence.
As has been mentioned on these forums over and over again, MBTI does not have all the answers. It's just simply a loose, fairly accurate (the trends are obvious if you watch, listen, and interact with people) interpretation of how people behave and what their preferences might be. Human behavior will be what it will be - regardless of what MBTI says. Human behavior precedes MBTI and it's theories/explanations. I have found MBTI to be very accurate in a general sense. This person is ENTJ - they have a tendency to be directive, to want to complete tasks, to stay on schedule, etc, etc. But, I have no idea what's going to make that person cry, or laugh, or what types of foods they may like, what will touch them, what will make them angry, etc. MBTI can't really explain that. These are individual things that make each person truly unique. 2 INFP's might be similar in their demeanor, their desire for time alone, their admiration for things that are artistic, etc. But, those 2 people will be moved, inspired, or hurt by different things. Only real human interaction allows us to experience these things - to see them come to life rather than just reading a theory on paper.
But, let's face it - I know "Te" when I see it. If I see a person who is very comfortable and expressive with people (extrovert) and very comfortable using Te, right away I know that they are most likely going to be ExTJ. IxTJ's are a little more subtle and reserved. So, when I see Te in use (only using Te as an example), I have a very "general" idea of what I'm working with - I know the person is probably going to be organized, expect results and conclusions in a timely manner, etc. But, there's also a whole lot that I don't know about them too.