I tanked for years, and switched to DPS, so i understand your plight, it can be hard sometimes getting into the content you want when you're competing with 80% of the playerbase who are also DPS.

Don't lose hope.

Do /not/ wait out your queues, don't just stand there, seek alternatives to keep you occupied and interested whilst you wait. This might be something as simple as going out and clearing a few sidequests whilst you wait, or just roaming the land and taking in the sights and sounds around you, helping people you encounter that are struggling in a fight.

Ask your friends, free companies, linkshells, recruit people for a group to go into content together with (not a static, it's not necessary to schedule your time so heavily). At the moment, when i'm queued, i roam around playing triple triad and trying to build my deck up.