If your dps is lower than a WAR, Titan won't be your only roadblock. Ifrit nails will just laugh at you. Regardless, if you really are underperforming by THAT much, I would suggest practicing rotations/timings to maximize GL uptime. I literally cant imagine a way you could get out dps'd by a warrior, but you definitely need to practice/to put it in a straightforward way...get better.

Even getting gaol'd multiple times, even having gl drop off here and there, I have yet to be out dps'd by anyone, and tanks are pretty low on those charts. So you're either just autoattacking and trying to dodge and not using skills or...yeah.

Read, watch videos, practice. Complaining wwon't get you anywhere, especially when it's something like this.