Personally, I feel like I have my TiNe face which is my true self, but when I'm uncomfortable around someone or in a situation, I have my Si face where I act like what seems 'normal.'
for me I'd put it like this
TiNe - true self
TiSi - really uncomfortable and detached
SiFe - uncomfortable but trying to act normal (this is really exhausting for me)
NeFe - overly excited and playful (only around those I'm extremely comfortable with)