All myths that are something more than fancies gain rather than lose in value with time, by reason of the accretions of human experience.
Keep on going and the chances are you will stumble on something, perhaps when you are least expecting it. I have never heard of anyone stumbling on something sitting down.
As an actor you have to have a strong vivid imagination as you're working and when the camera's rolling, but there's certainly a part of you that is aware of real life, that you're making a movie.