How do I delete my own personal account?

To delete just your own personal account, ask a person that is administrator in the company account to delete your account. If you are administrator yourself, you should still get another administrator to do it (you can't delete your own personal account). If you are the only administrator, you should first give administrator rights to another person, and then ask that person to delete your personal account.

If you want to close the entire company account that your personal account belongs to, see here.