There's tons of maps out there, and not many players go into some of them. Rarely will you see players in a not very popular map not meant for a roleplaying group. Don't worry, you did nothing wrong c: You could invite friends into the maps or share the maps around, and if you put the mouse over the side of the forums to the right you'll see the list of maps and how many players are inside. But yeah, sadly, you'll mostly be alone in most downloaded maps unless you invite some friends to come roleplay.
Hope this helps!
