Nick here from Shopify.
It happens to the best of us. You can delete your store by following the following steps. I will also link a YouTube tutorial for how to delete a store as well as the Shopify guide here:
Log in as the store owner.
From your Shopify admin, click Settings, and then click Plan and permissions.
In the Store status section, click Sell or close store.
Click Close store.
Enter your password to continue.
At this point, you can contact Shopify to see if there is anything we can do to help. If you're sure that you want to close your store, then select a reason from the drop-down menu and then click Close store.
Something to note is only you will be able to close your store, not even a member of the Shopify support team can do this for privacy and security reasons.
Let me know if you have any other questions!
All the best, Nick