Spacing
In this game you kept drifting too far away from your support in lane and in later fights, which left you isolated when Caitlyn could step up and punish you while Lulu or Senna couldn’t fully cover you. The fix is to treat your support as your anchor in 2v2s and skirmishes: if they can threaten peel or follow-up, you get to play much more aggressively because the enemy has to respect both of you at once. When you separate, you give up that layered threat and make it much easier for the enemy ADC to hit you freely while your support is stuck too far away to trade back.