If you want to have groups, start them. That is what I have always done and it has worked pretty consistantly for me for ever.
Being the main tank, find a healer and start duoing while you look for DPS classes to join you.
I see people all the time LFG and no one picking them up. The problem for most folks is that they don't want to start groups, they want to join them.
So spam this instead: Guardian (or Tank) looking for healer and DPS for XP group. Send tells for invites. In the meantime, if others are posting LFG in the channels / OOC then send them a tell and see if you can get them into YOUR group.
If no healers are available, grab whoever is LFG and just start killing stuff you can handle while you look for a healer.
If you just spam LFG in the channels and wait passively for someone to invite you to a group, you can wait a long time sometimes. Other times, you will be in great demand, since tanks, especially good tanks are hard to find at low levels.
Put people on your friends lists that you want to group with again and keep making up the same groups as much as you can.
I hope that helps you.
Good hunting.