In meditation you must sit with your own mind and notice if there is a tendency to fantasize about the future or dwell in memories of the past. H.Poonja, one of my teachers, courtly informed disciples who indulged in stories of the past events that they living in a graveyard, digging up old corpses that have been dead for a long time.
In meditation you must dispel fascination with the content of your thoughts and stop retreating into a private world of imagination. You wake up to the present moment.
We always come back to a simple space of present moment not memories or thoughts. Be here, now with me to experience and live our lives again!