My advice: stick with it. It can be depressing PvPing at low levels. People focus you down super fast, and you don't know why. Then you hit 20 and it makes more sense. Then you hit 30, take someone down to half health in 4 shots and all of a sudden it makes sense.
Rotations are hard to learn because abilities come at you fast. You need a LOT of things hot keyed, so learn how to do that. Memorize tootltips and figure out when to use what. For instance, Saber Throw has a heal debuff. Very handy in the right situation, which is true of many of our abilities. Learn them, hot key them, stick with it, and you will love it later