Most people edit themselves down without noticing, a habit picked up long before this relationship, in some earlier room where the full version was not welcome.
So the enthusiasm gets flattened. The odd hobby stays behind the door of the spare room, along with the model railway. The strong opinion about a football team nobody else follows goes unmentioned.
Being true to yourself here is not a confession made in a serious conversation. It is letting one of those things be visible on an ordinary Sunday, unexplained, left out on the table. Find where you are still editing and leave it in.