I am not sure how this happened but I have other gmail accounts and somehow they are all tied to my Brenau email account. It shows my mailto:xxxxx@brenau.edu as the default account with four other gmail accounts listed. How can we separate the brenau account from the others?

Gmail supports multiple accounts being logged in at one time so users can easily switch between them.
If this in confusing to you and you don't want to be logged into them simultaneously - just click on the email address in the top-right of the screen and choose ""Log Out"" which should log you out of all of the accounts.
This site explains the feature: