I accidentally went to Siri settings and changed the info to "Cassie" one of my contacts that isn't me.
What you can do is:


Make a blank contact
Tell Siri you are the blank contact (Set My Info as blank contact)
Delete the blank contact


That should remove the contact from 'My Info'

To make a new contact:


Open the Contacts App
Touch the Plus sign at the top


To delete a contact:


Open the Contacts App
Select the contact you want to delete
Press 'Edit' at the top right
Scroll all the way down and press delete