Next Week Im Flying Alone & Im a First time Fly-Er HELP Pleasee.!!?

Im Going From Tampa Florida to St.Louis Missouri BUT i Have a Layover For An Hour in Atlanta Georgia. im 15, Flying Bymyself, For The First Time. && Terrified.! Im Not Scared At All About the Plane Im Scared About the Airports, There So Big And i Feel Like Im Gunna Get Lost or Confused.! What If i Miss my Flight? What if i get lost? Will people Help Me? I Know i Sound Ridiculous But Im REALLY Scared.