Help a riven main

Ok so i'm a RIven "main" and i get fed in every match up may it be renekton or poppy but 2 champ are unkillble to me so my question for you guys is what to do if i have to play vs garen or irelia how do i play vs these 2? i consider them aids match up's and with the triforce buff irelia became more aids then she was. Pls an experienced riven hilp me
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