can't unlink from CRM and make new CRM

can't unlink from CRM and make new CRM

In CRM, my login is tied to a business group.  I no longer want to be associated to that business group, and want to have my own CRM account.  There doesn't seem to be any way to correct this -

The admin for the business group cannot 'delete' me from the list of users.
The only option is to 'disable' me, which then prevents me from logging in to CRM at all.

How can I completely disassociate from the existing business group and create my own CRM?