If you're doing Titan HM using DF, you should understand that most people are new to the instance, it's one of the more challenging fights with less forgiving mechanics, and chances are very low that (at this point) you will complete the kill.
Enjoy the practice. Celebrate the progress. Appreciate that you--and your random mates--are improving at the fight. Once you feel like you have your role down for that fight, build your group using your FC, friends, shouting, or whatever.
Titan HM at this point is really more for practice than anything else. This will change as people get better and a more established base of 50s hits the servers.
Good luck, and remember: HAVE FUN!