The field of study in psychology that is interested only in observed behavior, and believes that everything that you are is a result of what you have learned, is:

Social Learning

Explanation:

Social learning theory is a psychology theory that statutes that new behaviors can be learned in a social context by observing and imitating others, this is known as observational learning and it usually does not need reinforcement or formal learning, and it can be learned by observing another person's being rewarded or punished.

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