Changing your personality may not be as simple as you think. Most people have personality types that are inborn and not able to be changed. It is possible to develop some qualities about yourself that change over time. However, there are certain personality traits that you are born with and cannot be gotten rid of easily.
For instance, someone who has been shy since elementary school is likely to retain that shyness throughout adulthood. For the most part, no environment is strong enough to change your most important personality traits, such as shyness and aggressiveness.
In fact, humans are told to “stick with one thing” and grow with it. All your life, you are told to choose the niche that makes you the most comfortable, whether it involves a career or a personality. So, changing who you are all of a sudden does not make sense to most people.