Help choosing a Job

Hi all, I have a level 51 AST, a level 54, SCH, and a level 55 WHM

I haven't really decided on which job i want to main, and i'm rather torn in which one i want to place my focus on.

I love AST's versatility when it comes to healing, and their animations are beautiful, but like, i'd rather be a combat medic then tactical support, which seems to AST's main role because of how their card gimmick works.

I like SCH's ability to easily multi task thanks to how the shields and fairies work, and it feels like there's little i can't do in a party and DPS. But there are times where managing Selene Eos's position and cooldowns can get a little hard or tedious in harder boss fight

Lastly, I love the lore of White Mage, and their burst damage for healers is really silly. But unfortunately, a good chunk of the time, i feel like i'm spamming cure to keep everyone capped and doing nothing but Cure Spam.

If anyone could share their thoughts, i'd really appreciate it.

Level them all to 60 and play them all ^_^ That would be my generic advice. Healer gear is kind of....generic, and secondary stats are a bit meh except for SCH and crit (even then it's not the end of the world).

Healing end-game content is never single target cure/physic/benefic spam though it might feel like that at the moment around the level 50 range.

Based on your thoughts I'd recommend going WHM first, then SCH and AST last (if you were prioritizing levelling).
WHM will lay some good solid foundations for pure healing with a touch of stance dancing.
SCH will give you a bit more experience on healer DPS.
AST is a support role, and you don't seem to enjoy the cards. Cards are quite a distraction and if you don't like them it is probably not the role to play.

Just play them all. i190 gear is shared between jobs anyways.

If you're only going to level one, level ast.

Otherwise level them all. Having two of the same healer in an 8 man group is dumb and depressing unless it's 2 AST so you're going to want to switch with the others.