Julie here from Shopify Support.
Because each myshopify.com URL serves as a unique identifier for your Shopify account, it cannot be changed. Generally, your myshopify.com URL is only used to log into your store and identify your account when you contact support.
As you mentioned, you can most definitely use a custom domain as your primary domain, which can either be purchased through Shopify or from any third-party domain registrar. Once you've changed your primary domain, your myshopify.com URL will not be visible to customers and they will only see the custom domain.
As you continue working on your store and preparing for launch, I recommend checking out The Essential Shopify Store Launch Checklist. This checklist is a great resource that will help you ensure you've done everything necessary prior to launching. I think you'll find it quite useful!
How is the rest of your store coming along?
Julie | Social Care @ Shopify
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