How to find out if you are just bad or your jungler is really bad

https://gyazo.com/1329cdf184787d6fe2858f3cb2a6a788 You look at their kill participation as a jungler. This is just disgusting how low every game is for this player lmao. I look and hes an ahri one trick so plat 2 ahri and bronze everything else lol Ended up making alot of sense to why he was feeding my lane.