Yeah it can suck. :/
One thing for that has helped recently is playing bot, supp, AND jungle sometimes. As a supp main trying out bot I get a better understanding of what an adc needs from support beyond what I know of my role already. I already know what the botlaners need from a jungler (like not ganking so far downlane from us that you're getting caught beyond our ability to get to you in time, being aware of the botlane being oom and limiting my expectations of them accordingly, etc). But by playing as a jungler sometimes, I learn also what a jungler needs from US (try to keep control of vision on that river bush, and deep-warding allied and enemy buffs is always appreciated by allied jungler).
An adc often likes a support to be right up with them in lane when possible, so they don't have the uncomfortable feeling of being in a 1v2 all laning phase. Even though they're not, it can FEEL like they are, and that can put them on edge. Also, asking them "hey, could you help with warding bushes till I get sightstone?" can increase cohesion and cooperation, and also helps keep lane warded early, preventing successful early enemy ganks. Lack of successful ganks =happier, more peaceful adc. (granted, we should ALL be warding all game, but meh)
Lately, I've started just saying "saved ya! <3" or "saved my adc. My life is complete. <3" etc, if I've died or taken huge damage in order to save a teammate who would otherwise have surely died. It's had good results on the teams I've been on.
