how do you know if you win lane or not?

so if you keep killing enemy laner whenever hes in a shitty position and have higher kill potential than them in general but they murder your minion waves and towers whenever you roam with a 0/6 score they won lane and you lost? this is just pure bullshit... if assasins aren't meant to win lane because of their shitty wave clear and low damage to towers then why do people play them
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