Like the other replies have said, it's now very solo friendly. You might have to party up here or there, but for the most part the MSQ (Main Story Quests) now offer a path to bring in NPC characters to help you through dungeons and the like. So if you are just in it for the story and simply don't want to play with people, then you can do pretty much all of that solo.

HOWEVER, this is not a community like WoW where it's toxic as hell. Everyone gets extra rewards if they play a dungeon with someone who has never done it before so it's actually nice to have a newbie in your party, and generally people are super chill if you say "hey, it's my first time" when going into a group activity.