I feel useless as ADC without a good supp

I usually play mid and jg and I feel that I have a lot more impact in game by contrast when I play ADC, more specific when I don't have a good supp to protect me ( if i go in without protection i die in 1 sec). Even if i am fed or have 3, 4 items i feel useless. Do you have any advice how to play this class and help the team more? I like tristana and kog'maw...how do you build? How do you play them? thank you!

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