Oh, glad you found a place to watch it.
The opposite aspect has more to do with a person’s chi that the physical aspect of the opposing element. So Korra has trouble with air-bending because she is so bull-headed & undisciplined. Water is always moving & that’s the way Korra prefers it & it melds well with her own personality. Korra is always want to be moving & air-bending takes patience which – as she’s demonstrated, she has trouble with.
I have my thoughts on her other bending styles but that’s going into theorizing territory & I really don’t know how much you know about the anti-bending movement & Amon yet. So I won’t discuss it in depth or rather, at all.
But I’m glad you like Jinora, Ikki & Meelo ( the 3 air-bender kids ) – as of right now my fav. character is Korra followed closely by Bolin & Mako.