Questions surrounding Main Champions

recently i had a discussion with my friend on league and some interesting questions came up i thought i should share.

(after a good game with kha'zix where i pretty much carried the game though my team was very skilled we easily could've lost)

i dont know why i dont main kha'zix i main thresh because im supposedly good with him SkyTroupe: he's fun ChromeFluxx: but i really am not good at thresh xD SkyTroupe: lol ChromeFluxx: things just generally work out more with thresh like i played thresh yesterday SkyTroupe: he has a higher base luck ChromeFluxx: and got criticized as "never landing a hook" "i havent seen him land one hook this game" "i main thresh, he says. gold V he says" "HAHAHAHAHA: no." all things that were said to me i felt really down and then i realized i haven't played thresh in over 4 months well right now i'd say im more skilled at yasuo or kha'zix than thresh and i have more fun with each of them the problem is, i dont WANT to be good at yas or kha i just AM i WANT to be good at thresh i constantly try to improve when i play him when i play kha and yas i just do what i do and get an ez win SkyTroupe: the struggle ChromeFluxx: that's what it feels like 4 me is that being good at a champ? or is that what defines a main champ?

What do you think?

Is being good at a champ wanting to improve and becoming better? or is that what defines a main champion. One you play more often because you're not good at him, but you would like to be. What does that make champs like Kha and Yas where i just naturally do well with not because they're overpowered but because im just better at playing them.