Dont worry about being at the same level or speed of anyone else. This is your journey, how long it takes only matters to you. Have fun, enjoy the ride. The team is currently working on the 6th expansion(which will be officially announced in a few weeks). When that goes live then in an instant no one will be caught up anymore. Some people will rush through it in a weekend, others will take months. Being caught up is a moving target that only matters if you want it to. And while you wouldnt have much of a chance to experience this yet, the game has a decent match-making system to help newer players run older content(including bonuses for veterans going in to help). That in addition to a great deal of the content supporting either group or solo options. Best of luck!