how to hit champions and not minions?

im a platinum player but for as long as i can remember iv had a problem with hitting minions when i want to hit champions.. especially when melee vs melee. i was just playing as darius against a riven.. riven jumps on top of me and im using attack move and i auto + W a minion.. and because of that i die and she lives on 10hp. it happened exactly the same next time she comes to lane and she snowballed the game and carried. really starting to piss me off to the point where i could put a hole through my monitor. i use attack move to hit literaly everything.. last hitting minions, kiting, hitting dragons wards etc.
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