Since an introvert or extrovert person can actually be classified as one or the other, chances are we are born that way, but environment does have an effect on our self esteem under the guise of being introvert, so both can be factors.
Since an introvert or extrovert person can actually be classified as one or the other, chances are we are born that way, but environment does have an effect on our self esteem under the guise of being introvert, so both can be factors.