Is it possible to change your type? Either intentionally or unintentionally? Can you be one type as a child, another as a teenager & again another as an adult, or only one all your life? Can you "train" yourself into another type? Interesting you ask this I was questioning the same thing last night in my head. I like who I am, but sometimes I feel pressure from society to change, to have ambition & motivation to succeed with school & career. It seems my ESTJ boyfriend knows how to & can do everything, I would like to feel his determination. That or an ENFP.
Typology is all about preferences, so if you prefer to think before you speak then you will be an introvert; then again if time passes and you notice you like it better to start talking as you develop your idea, you could become an extrovert.
It is tricky though...
if you are an INFP (Fi-Ne-Si-Te) and have a strong Ne (extroverted intuition) you could train your Te by focusing more in creating structures and timetables, developing complex plans etc. and start paying more attention to measures and evidence. If you do this well enough and start liking it then your Te could become stronger then your Si, and you would have the chance to probably change into an ENFP (Ne-Fi-Te-Si).
This would mean you would have to change the way you are right now completely. Instead of living in your inner world of values, and paying most attention to whats right or wrong, you would have to change your mind into focusing on the outer world and start noticing how patterns develop in your relationships.
So you would have Fi as second and Ne as primary. You would probably start paying more attention to how you can activate switches, so to speak, in people and could become somewhat a manipulator. Still if your heart is right, then you would notice how you can move people into becoming better... if that's what you want then start training right now
remember your world works right now something like this:
inner values lead supported by high imagination to what would be the best for your values. Your imaginative world is shifted as you grow older, catch more experiences, and gather concrete data. This idealization of your perfect world is rarely supported by structure or linear thinking, you mostly change your perception into what's better from time to time.
if you change your world would become something like this:
world of possibilities in your relationships. Your awareness is focused on people and what could become of them if they followed certain values. You start developing plans and gather evidence of how people interact and what activates certain reactions. Your would pay less attention to concrete data, and start thinking people are always different, so experience is not that important... you will be noticing how to best your relationships in real time action, living much more in the present moments and ignoring what you already did.