HELP: Looking for advice on vayne.

Playing Vayne alot again recently and iv'e come across a serious problem/issue that i find myself in almost 50% of games. I CAN'T play with a utility support! I really find it hard, lanning phase is easiest with a utility support but as soon as mid game comes i just feel vulnerable and alone. I find myself peeling for myself alot of the time, it's not due to them being bad supports but i feel rather the champion they play. Tank supports or fine. If any of you could give me a suggestion for positioning or any help in anyway i would greatly appreciate it, thank you fellow summoners.
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