Rage Quitting this game

[Yuella]

Sounds crazy but I always tell people play tank. Its the easiest role in the game for regular lvling content. You can face tank alot of mechanics and survive. You dont need to memorize alot of things because its the dpses job. You dont have to keep your butt alive as well as cover for others stepping on aoe like healers do and the queues are great.

Healer to me is the hardest because you are basically the backbone of the team that smooths over others mistakes by healing them through it. I dont really like healing at all since the potency/ dps nerf.

Parties sometimes want tanks to pull big and newcomers may not be comfortable with it

[Rilifane]

Parties sometimes want tanks to pull big and newcomers may not be comfortable with it

Parties sometimes want healers to dps and newcomers may not be comfortable with it.
Parties sometimes want good aoe rotations and newcomers may not be comfortable with it.
If you don't want to pull big, tell them. They'll either leave it at that (most likely) or kick you (rarely happens because getting a new tank takes longer than finishing a dungeon with single pulls). This whole "they may want this or that and it could be uncomfortable for you" is just needlessly feeding "tankxiety". Just like all this talk about how a tank needs to know the whole dungeon by heart, lead the way, know how capable a party is at a glance etc.
There will always be players that want a different playstyle from you regardless of role. But the solution to that is really quite easy: communicate. It's not that difficult to simply tell your party that you're not quite used to tanking yet and will keep pulls smaller. I honestly can't remember someone ever getting salty over it or even demand a kick.
The general reaction is as simple as "ok".