When you sit down to eat and automatically pick up your knife and fork, this is an example of what process by which a norm becomes a part of an individual's personality, thus conditioning that individual to conform to society's expectations?

I believe the answer is internalization.

Internalization refers to the psychological process that make us see a certain things as automatic or something normal even though it may not be the case in other culture.

For example, in other cultures besides united states such as the Philippines, it is internalized to perceive eating with bare hand is considered normal