@SoniaTorres
Your records should be marked with something to identify the user.
You can utilize the Created By column that comes with any list or you can use your own.
So if you use the Created By operator, then you would LookUp that record ex: LookUp(yourList, 'Created By'.Email = User().Email)
If you use your own column, it can be a Person column, but storing an email address in a Text column is sufficient. Ex. LookUp(yourList, StartsWith(yourEmailColumnName, User().Email)
I hope this is helpful for you.