I remember when I started paladin tanking in WoW in TBC. I recall it being very frustration keeping enmity on multiple mobs because I couldn't use aoe because it would break CC. After running many dungeons getting the required gear to become uncrushable things got a lot easier. I was able to start aoe tanking and run dungeons really fast where warriors could not do that easily. I started to love tanking then because I never had to worry about being in a party with a bad tank. I had complete control of the flow of the dungeon.
Today I'm pretty much a master at tanking and still love it. It really doesn't matter what the make up of the rest of the party is in regular dungeons, they just need to be somewhat competent and we can easily clear it. When I go with my FC members the DDs and healers don't need to hold back and don't have to attack the same target... (I still prefer them to attack the same target though). I hear horror stories from them when they do a dungeon without me since they are used to my tanking style
This is why I am a tank.
My Tips for being a good tank when leveling though dungeons:
1. Upgrade your gear. Just simple upgrades can make a world of difference in increasing your enmity generation and making you easy to heal. I usually upgrade my weapon before entering a new dungeon and run the dungeon multiple times to get a few pieces.
2. Look up a guide for a dungeon you haven't been to before; chances are you end up with all new people who don't know the dungeon. Later dungeons have mechanics that can easily wipe party for those who are not aware of them. New dungeons are a lot less stressful when you know what to expect.
3. Do small explanations of key mechanics of bosses that could wipe the party to new players.
4. flash/overpower multiple times for 3+ mobs so that the healer never takes a mob from you. Switch to combo rotation against mobs DDs are targeting. I rarely use Riot Blade unless a blow all my mana from 4+ mobs where BLMs are aoeing. If someone pulls a mob wait for 2nd or 3rd combo move before using provoke then follow it up by these.
There's light at the end of the tunnel once you get pass the stressful part of learning to tank.