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Hi,
The front facing camera captures the portrait correct but the view finder in the camera application works as a mirror. This is how the front facing capturing mode is designed to work and it's not possible to change this via any settings in the camera application. It's possible that there are third party camera applications available on Google Play store that works differently, if you prefer the view finder not to mirror your portraits.
You can edit your photos with built in photo editor to flip your images afterwards. BTW as @Hampus suggest that there are some apps that work different then stock camera for e.g. style portrait ( by Sony) I guess it will suite your needs.