Hi Beatriz, great question! I don't think it's possible to change one's personality, unless something else happens within, such as a drastic change in values (e.g. if someone experiences a 'religious awakening' and their core beliefs about the world change.) However, depending on the context, anyone can choose to behave in a certain way to adhere to cultural and societal norms. Therefore, the behaviours change, not the actual personality.

Very true, shyness and introversion should not be interpreted as equal. There's too much misinformation about this.

Thanks so much for your comment :)