As an ADC i do not do the highest damage in the team

I wonder what do i do wrong, i mostly play Tristana and win the lane, but never get the highest damage in team,i might be like 17/3/10 but still have lower damage than one or two teammates, i mean it would be normal if it would happen once in a while, but in every single game i do lower damage than my teammates, so i wanted to ask boards to help me, maybe give me advice, or come watch my game and tell me why i don't do damage
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