I don’t think it’s changing personality as much as adjusting one’s behavior to fit the situation.

Lots of people cuss or use other somewhat harsh words in certain situations: bad driver cuts us off on the road or we burn ourselves cooking. We don’t use the kind of language at dinner parties or at work or in church.

I have loud voice but I don’t speak loud in the library or museum or at funerals.

Adults adjust their behaviors to fit the situation and be appropriate. Only little kids behave the same everywhere. Ability to alter one’s behavior is a sigh of maturity.

Nothing to do with personally change