@AdhamFH
There's a pretty cool function called USER that will help here. User will show information about the current user logged into the app. To get familiar with USER I suggest you temporarily put each one of these in a separate label and view the result.
User().DisplayName //shows the first and last name
User().Email //shows the email address
Now that we can tell who the current user is which should we use: DisplayName or Email? I prefer Email because it will always be unique for each User. DisplayName is not recommend because there could be a case where two users have the same name (e.g. John Smith and John Smith)
Next open your spreadsheet on Office365 and add a new column to your table called Email. Put your email beside any items belonging to you. You will need at least one record belonging to you for my mini-tutorial to work. Then add the email address for any remaining users.
Go to back into PowerApps and refresh the datasource. Do this by going to the left-side menu, clicking the datasource name and selecting Refresh. Now open your app's BrowseScreen and click on the Gallery. Change the Items property of the Gallery to this code.
Filter(your_datasource_name,Email=User().Email)
Your app will now only show records belonging to you (the current user)
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