If you've loaded up your PS4 console and found your saves are missing, or the wrong username has popped up, then you might just be signed into the wrong account.
To keep using your data, you'll need to switch accounts.
This is very easy to do, and just takes a few short steps. Here's how to do it.
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How to switch accounts on your PS4
1. Check the top of the home screen to see what account you're logged in to. Confirm it's not yours.
2. Hold down the PS button in the middle of your PS4 controller to access the Quick Menu, and highlight the Power option.
3. Select "Switch User" from the menu on the right, and you'll be brought to an account selection screen. Select your account if you've already made one or, if you haven't yet, create a new user to switch to.
You can switch accounts at any time by navigating to the Quick Menu and following these steps.