@Murraymoody thank you! But I saw "I be" in some music or something like that. I didn't search it means,so I forgot the music tittles. I'm sorry.
And I heard that "I been"is African American Vernacular English. It's used instead of "I've been". I'm not gonna use it but the reason why I said it is I was guessing how the answers come like"Isn't it I been?".
Anyway, it seems like I won't use it in normal conversation. Thank you!