Very good Riven stats, high above average, 27% winrate? What am I doing wrong?

This is a serious question, I'm trying to improve, not trying to rage or blame my teammates (seriously though, I may be a Riven main, but don't stereotype me). So, heres my LoLKing page: As you can see when you click on it, I'm a scrub {{champion:157}} {{champion:266}} {{champion:92}} main, and I have well over 60% winrates with both Yasuo and Aatrox, but I only have 27% with Riven. I am well above average Master/Challenger players with all my champions, especially well above Master/Challenger as Riven, but this winrate REALLY worries me. It's also not motivating me to play more. As Riven, I always take {{summoner:12}} {{summoner:4}} to help my team and tp to bot if I have to, this is true to 1 exception. When playing against {{champion:126}} I take Exhaust, because it helps me win lane after 6 and push the tower before he does. In the midgame I roam around getting easy kills and catching out squishies with my Flash combos, but even without flash I get quick kills. I also try to capitalize, and focus a lot on farming so I can outdamage the enemy. My standard build against a balanced tank/squishy team is: {{item:3071}} {{item:3111}} {{item:3142}} {{item:3139}} Against squishies only: {{item:3147}} {{item:3814}} {{item:3142}} {{item:3047}} When I have a very squishy team, I go for tanky builds because we don't need more damage: {{item:3071}} {{item:3111}} {{item:3748}} {{item:3742}} {{item:3065}} (Rest is situational). From what I've just told you, is there ANYTHING at all I'm doing absolutely wrong that affects my overall winrate? Is it because of me, or is it because of Riven being out of meta? I would REALLY appreciate any tips you can give me, and I'll accept them with respect. **Thanks!** {{sticker:slayer-pantheon-thumbs}}
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