When the mind wanders, it takes you to wonderful places, average places, horrible places. Places that do not exist. Places that often determine your joy or sorrow.
The only thing that is real, though, is the here and now. What you are doing in this moment, the context you have around you, the possibility for you to decide to change the activity and the context. And your mood.
A wandering mind can take you places, but train the capacity to come back to reality at will.
It’s a muscle that can be strengthened.