You are Boa Hancock's child, you can choose age, gender etc. You grew up on Amazon Lily and still live their with your mom and aunts.

Boa was on one of the many beaches of Amazon Lily with her sisters and the Strawhat crew. Boa had decided to release the Strawhats on account that Luffy was very selfless and could provide a good Ally if the time every came. Luffy turned to Boa and thanked her once again.

Luffy: "Thank you Mrs Hancock, its so nice of you to let us stay the night in Amazon Lily."