Welcome to FFXIV! The game is actually quite group oriented in my opinion: much of the story content involves dungeons and trials that you need to do with others, and pretty much all leveling is done in groups. End game content is for groups too. But I understand it may feel lonely while you're working on the main scenario and there are long periods of time when you just run around completing quests solo. For this, it helps to join an active Free Company (preferably one where people will join you for your story instances and dungeon roulettes too!). You can also join the Novice Network on Phoenix (shout for an invite in any city), it's very active and you can find company for dungeons and other stuff there.