Support your other lanes. I don't mean camp out in other lanes and sap EXP, but you can always look for opportunities to roam and get down vision or gank for mid lane or something if your ADC is just freezing under tower. There's also a chance you're playing too aggressively, but you'll need to decide that for yourself. The supports you're playing are also pretty good at ganking other lanes because of the CC they offer; Lulu also gets around pretty quick with her W. If you're playing with passive players, though, sustain or poke supports are probably better, like Soraka, Sona, Karma, Lulu, Zyra, etc. You can just use your poke to zone them out of lane and your ADC gets ahead that way. Of course, if your ADC is just running from fights, it's probably a better idea to focus on supporting players that will actually help you win the game (for example, I was playing this game where my ADC was not doing bad by any means, actually a pretty good ADC and I was able to get him a few kills, but our Akali mid lane was just going ham, so I was flashing over walls just to shield her and let her kill everyone and we won pretty convincingly)