Hi.

Two things
1. Personality
2. Individuality.


Personality of a child develops from his birth when he started interacting with world around. With mother, father, relatives etc. So the personality is an effect of socialization. It's a process where an individual feels he is a part of society.

Individuality on other hand starts when he starts identifying himself as different from the society. When he starts drawing lines between himself and society. This process starts later in the school age when nearing to the college it peaks. It's something like reflecting and seeing himself into the society and feeling and identifying how he is different from the rest of the world. This individuality grows more the more he is socializing himself.. the more he socializes the more he identified his individuality. When a person grows into too much individualism he starts rejecting the society. He detached himself from the society.

We see few people with less socialisation and hence we see underdeveloped individuality. And few people with too much individuality so that they deny the society altogether.

I hope this will give you some understanding to the question.