I created this account some years ago with a college gmail address. I ended up forgetting I had this account and made a new one through my current gmail address. But within the 1st week of using my new account I came across a question I had asked years ago. It was then I remembered I had my old account and logged in to revive it. I was hoping to mitigate it and change the email address on it to my new gmail account, but since I had already created an account for my new gmail it wouldn't let me change it. Is there anyway to mitigate the two accounts, or delete my account on my new gmail and change the email on my old college account to my current gmail?
Summary: Yes, it is possible to merge accounts, but the process is not automatic. Someone from Stack Exchange needs to verify that you own both accounts. You can get things going by picking "I need to merge user profiles" from the Contact Us link.
If all you want to do is change the email address associated with your account, you can add and remove login credentials from your user profile page by clicking on the "Logins" link: