Help me understand rengar

Recently I've been trying to branch my jungling roster. I've mained kindred since sue was released playing others off and on. Recently I've picked up an interest with rengar. But tbh I don't understand how he can be useful at all. He feels insanely squishy to me when I play him. I jump in, do almost no damage and die. I do have a comfort level with kindred since she's a ranged champ. But then again when I play people like xin' I can do fairly good. When a teamfight breaks out and there's no opening for me to jump on a squishy I feel absolutely useless. Any rengar pros out there?
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