What if I've never completed a single Zelda game?
That's strange. Why have you never completed a Zelda game?
I don't like the fire and water elements of it and I think it's hard for me to play
It is ok not to finish video games. Video games are supposed to be fun and you shouldn't have to complete a game if you aren't having fun.
But I like most people think that if you don't like something, you should still try it. It might change your opinion about it.
But you shouldn't force yourself to like or enjoy something. You might grow to hate it if you force yourself  to complete a game.