Hi there @SimeonDieterle !
Welcome to the Instructure Community!
Are you by chance using Free for Teacher? Your URL would be canvas.instructure.com or k12.instructure.com. If so, good news for ya! You are able to self merge your two accounts together. If you are not using free for teacher, that's also okay! It's possible your institution enabled this feature for you. If not, it would be best to reach out to your school's canvas admin for assistance.
Here's a link with some additional information to help you out! https://community.canvaslms.com/t5/Canvas-Basics-Guide/How-do-I-merge-my-user-account-with-an-accoun...
Unfortunately, the general Canvas user does not have the ability to delete their own Canvas account. That would be something you'd need to reach out to your Canvas admin to get assistance for.
Reach out with any additional questions, thanks!
All the best,
Noah