Here's why:
* Pidgin languages are simplified forms of a language that develop when speakers of different languages need to communicate. They have limited vocabulary and grammar, and often rely on the dominant language for structure.
* English has a complex grammar and vocabulary, developed over centuries through contact with other languages.
* English has a long and rich history as a standard language, used in literature, government, and commerce.
It is possible that you are thinking of creole languages, which are languages that develop from pidgin languages when they become the native language of a community. While some creole languages have English as a base, English itself has never been a pidgin language.