Tell me what you think

recently i played a matched vs a lux and after getting her first blood i got CAMPED to death and fed hard,resulting in a defeat this is happening every time im up against a lux player get first blood,camped,lose To people telling me to buy wards:1) she didnt even push lane , stayed underturret ALL the time and i had to push as yasuo to get 3rd q 2) even when i didnt push i got towerdived everytime 3)This happened to any game i was up against a lux