I cannot win versus bronze midlaners as a plat 5

I've made it to plat 5 with amazing support mechanics and that alone. I can't even beat bronze midlaners because I've never really had to play mid. Can someone tell me some key points to keep in mind? I can outfarm the opponent no problem but mechanically I am incapable of understanding how lanes work, when to harass, and just the general mechanics of the lane. Can someone teach me how to do any of this? I'm tired of being laughed at by bronze players who can beat me in lane and say I bought my account when I got there from primarily supporting.
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