Just in need of some general help..

[ChameleonMS]

Welcome to Eorzea. First and foremost, Final Fantasy is a story driven game. Nearly every optional game feature is locked behind a Main Story Quest (MSQ). To experience the entire game you must complete it. How long that takes you is up to you.

If you are feeling like you should be levelling other classes, then level other classes.
I would recommend playing at least one of each class type for a little while to determine which type of play you like the most.
Tanks: PLD, WAR
Healers: WHM, SCH
Melee DPS: MNK, DRG
Ranged DPS: BRD, BLM, SMN

After you reach lvl50, SAM (melee) and RDM (ranged) are unlocked, assuming you purchased the Stormblood expansion.
After you reach the Heavensward story and travelled to Ishguard, DRK (tank), AST (Healer), MCH (ranged) are unlocked.

I started the game playing Pugilist (PUG / MNK). By the time I was lv40 ish, I really did not like playing it.
I then tried BLM, PLD, DRG, WHM, and WAR. I finished the MSQ as WAR. I also levelled the crafters and gathers too.
Yes, this spreading myself did cause me to take several months to complete the MSQ but it worked for me.
If you are a raider, then you will want to get to the end game and gear up before the next major patch; about 4 months from now.