My first DPS was ARC/BRD back in 2013. I then found myself trying DRG and eventually NIN (I don't care for casters, and I couldn't do MNK).

BRD, DRG, and NIN, while fun for me, makes me sad in the raid scene due to my lack of high dps, although I'm hitting all combos and abilities (every Trick Attack landed and Dots don't fall).

That said, my last resort was tank (started the game as CNJ). I had leveled both WAR and PLD to Lv50 in 2.x but didn't do anything with them. I tried PLD after my NIN wasn't accepted into Statics (thanks to fflogs), and found tanking to be more of my speed.

Unlike my DPS classes, I took time to research and learn PLD...and when my PLD was doing more damage in Shield Oath that my NIN was (who was higher iLv than my PLD at the time), I knew I had to re-evaluate my job/class/role.

My PLD's dps, while still low by today's standards, is gradually getting higher and higher (reaching 2k dps as PLD happened unintentionally, but made me happy). I like DRK and WAR as well, but PLD is my main. I'll be going into 4.0 as PLD.