What can I do when bot lane has a lot of poke?

First of all i'm portuguese so sorry for my bad english! I would like to get some tips. Like. I was playing Vayne with braum supp and my enemies were Ezreal and Xerath! I couldn't farm, couldn't poke either. Basically my early game was a mess. Had like 50cs at 10m and died 1 time. What can I do when i face this type of matches? Any tips?
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