Hi, @gustavo-garcia !
Rae from Shopify here. Thank you for posting this question.
To log in as a customer on your own storefront, I recommend creating a customer account for yourself on your website, just as a regular customer would. To see this option, make sure to have customer accounts enabled within your admin.
Creating this customer account will require you to use an email address and create a unique password tied to your customer account only. Once you’re logged in to this account, you will be able to see the order history, as well as account details - such as saved addresses - tied to your account.
Is this the type of setup you’re looking for?
Please feel free to share some additional information about why you’re looking to login as a customer on your own site, and what details you’re hoping to see when you do this. Once I have more context regarding this, I’ll be glad to help further.
I look forward to hearing back from you!