You will have difficulty finding fellow players who are doing quests in the same area you are, but you may find that the majority of the population socializes and organizes groups in the GLFF channel, or you could join a kinship with players willing to keep you company along the way. The server is by no means empty, especially with the Helms Deep release not too far off. A lot of new and old faces, as well as an influx of alts have shown up recently to prepare for new content and a new level cap.
Shumzuda made a very good point, the world of Middle Earth has grown significantly over the past few years. Players are more spread out. Being on your own isn't all that bad, and if you ever need help there's always someone out there willing to lend a hand.
If you would like to each out to other players that way.