when u face someone higher ranking and u realzie u were alot worse and below avg than u tough :(

after a long break from league, having started patch 5.4, i got to silver in s6, mainly by playing old talon, clicking in the middle of the enmy team wrhydra oneshotting all of them and winning the game over and over. But i should have known my echanics and game knowledge was still bronze when id fail miserably while playing other lanes and champs. Today i was facing a gold vayne in ranked since it was preseason, and i was playing akali wich i was still newly fammiliarinzg with since talon was banned. while i won lane, vayne snowballed insanley and i couldnt touch her. she had a malzhar and skarner constantly protecting her, and everytime id try to burst her id get hit with malzh ult and die instantly. eventually she got so fed even i couldnt 1v1 and shes oneshot my team mates one by one. i truly felt powerless in this situation it ws one of the first games i ever played where there was actually a back and front line. i want to relearn most of the game now and be a better player. im one of thise players that dont know the health and dmg numbers i be like maybe this is enough to kill this champ and go for it; while im usually accurate or close i reallzie when watching streamers its an unefficient way. now i want to learn 2 champs i can play for top id and jg, where one for each is an assassiny champ i can go around roaming and bursting adcs, while the other may be cc or control. i currently have 6000ip so im fresh to buy a new champ. any advice or coaching that can be offered would be appreciated