What constitutes to authentic or inauthentic memory or is it too complicated to examine memory through the lens of authenticity and inauthenticity, since memory is always shifting and changing?

Authenticity comes from being true to yourself at all times, which can be attributed to the internal forces within ourselves. Inauthenticity occurs as a result of external factors, such as the world around us. Because our thoughts and memories are filled in by external factors, it becomes nearly impossible to have truly authentic memories. Because (as it states) memory is always 'shifting and changing' it is not possible to have purely authentic memories.