The choices you make impact later scenes. If you decide you don't like something, you'll dislike it forever (unless you change your mind later) and people will know that. Things you do or say can become a running joke. The dynamics you have with other characters will be remembered by the game and characters will treat you differently because of it. But the choices are all about who your MC is and the relationships they have. There's no plot that can be altered with how you live your life.