If at any point in a natural conversation you're going to a trick a book taught you instead of just speaking your mind I'd argue it's a mask of a kind.

Example: if at the start of a conversation a personal anecdote comes to mind but you think 'no that's not what the book said, I should talk about the other person instead' I'd argue you're masking your natural persona. If your natural inclination is to raise an eyebrow but no that's not what I was taught smile instead, that's a mask. You see it often among high earning people and it's pretty transparent. Luckily you often also see people who are not at all like that everywhere and they're the ones I'll prefer having a drink with 10/10 times.