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A lot of people have the same problem and end up failing at adc hard because they continue to make mistakes instead of learn. You already stated your problem and that is being too aggressive.
You don't need to make plays as an adc, you need to capitalize on the enemy failing to be in a good position. Which generally comes from being too aggressive. For instance an adc is sitting in the middle of the creep wave. Blast them because they will either burn a skill to get past creeps (we've all been stuck in them before), or even better a summoner skill but don't chase!
As an adc it's all about not dying rather than getting kills. Because once it starts to snowball on bottom lane it takes an awesome jungler to turn it around.