Play WAR or DRK. I only play my PLD when someone is already playing as DRK in the party.

PLD can be very boring especially in the early leveling dungeons and trials. I find PLD to be fun at lvl70 but anything below that its meh, same for DRK without TBN.

Tanking is a mindset. Rather than thinking of just targeting mobs and doing a rotation. Think more outside the box when attacking groups of enemies. Such as this mob is charging up a move better stun him, or this mob is casting a spell better silence, or AOE these mobs.

Dont think of tanking as just grabbing enemies and holding aggro, because with that mindset it becomes very very boring.