Can your personality change?

People say your personality cant change and you will always be the same person.

As a person goes through life crises and events a personality changes. A person would have to live in a vacuum to not be affected in someway by the events that they participate in. A outgoing person who experiences a great deal of tragedy may become quiet and introspective. An individual who is shy as a child may become outgoing and gregarious as they become to participate in more activities during school and their esteem increases.