One of the biggest life lessons I had in 2009 was that my personality is in a state of constant change. The change may be small, subtle, and quiet or take big, life-changing leaps, but it's there and it's continuous. The fact that personality changes over time is not a big surprise in itself; I think everyone can take a look back a few years and immediately see how they were different back then compared to who they are now. However, I've hold the assumption that it takes major life experiences - such as break-ups, marriages, parents getting divorced, moving to live on your own for the first time etc. - for a personality to change, but considering everything that has happened in my own thought and behavior patterns during 2009, I have had to abandon that belief.

According to Dictionary.com, the definition of psychological personality is
a) the sum total of the physical, mental, emotional, and social characteristics of an individual.
b) the organized pattern of behavioral characteristics of the individual.
In psychology, the act of learning implies behavior change. Meaning, that when something is learned, the behavior of the learner changes as a result. If personality then is an organized pattern of behavioral characteristics of an individual, learning changes also the personality of the learner. This does not require major life experiences. With open and curious mind it's easily possible to learn something new every single day, and the cumulative outcome of that learning is a changed personality.
It's very important to realize, that no one is born more confident, social, outgoing, competitive, creative etc. than anyone else. Your early life experiences are paramount in the forming of your personality, which affects how you behave and think in different situations. Although your personality greatly determines how you think and act, the way you think and act also affects your personality. It's a two-way connection.
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