Development of Functions

First before I start, I guess it'd be somewhat important to clarify my age so that it can be taken into account in the analyzation.

Now I'm 17, pretty young. Was introverted for most of my life... but recently have become QUITE EXTROVERTED. Actually though if I think about it only if I feel comfortable with myself and the people I'm around.

I've met some great people during this time, and have been developing functions which i believe to be Fe/Se. I'm not so sure which it is. I readily show emotions AND follow impulses. Sometimes I feel I can be a bit insensitive though..
I don't see the Fe working in a way that I would see an INFJ using it. I dunno, perhaps my perception is wrong.
I don't feel intuitive lately but I'm enjoying it a lot! For once I'm getting friends who help me follow impulses and show my emotions.



Another thing is while it IS nice.. I feel that part of it has become a social mask.
It seems so easy--Life seems so easy for people who follow Fe/Se/I guess any extroverted function.

Anyways, I think my Ni is being PUSHED BACK.

I think I'm having confusion because the extroversion seems so overwhelming. Can anybody explain to be how INFJs would act according to their different levels of development?