Psychology 9-1 GCSE - 

7.1.4 - Understand the role of internal and external influences on the self and self-esteem, including:

a) temperament - 

Your temperament permanently effects your behaviour and in a big way. It may determine the nature of the situations you get yourself into and how you react to them and what effects they have on you. Your temperament also effects your self esteem.

b) Experience -

Experiences shapes the way you think about the world and yourself as it shapes your schema. It is not just dependent on experience alone its how you perceive these experiences and whether you learn from them or not. Childhood experiences shape our base schemas and temperament as this is where we develop most of our understanding of things.