Why are Platinum Junglers so god damn bad

Why does it feel like my Jungler is so awful every single game? I don't understand why every game the enemy gets a fed who just 1v9 carries. Like I'm not even gonna say "OMG LOL EVERYONE ON MY TEAM FEEDS EVERY GAME DUUUUUUUUUUUUUUDE" if anyone on my team just had the slightest amount of map pressure from our Jungler everyone would do fine.

Me: Sit under tower freezing wave Jungler: doesn't gank Jungler: gets invaded and dies Jungler: Starts pinging me for the rest of the game Enemy Jungler: Tower dives Enemy Jungler: Walks mid gets a kill Enemy Jungler: Walks top gets a kill Enemy Jungler: Invades our junglers camps Enemy Jungler: Gets Dragon Enemy Jungler: Gets Rift Herald Jungler: "Omg guys our ADC is so bad guys, why is every lane feeding guys omg guys"

Just letting you know if you're in Gold and trying to climb to Platinum. Don't even waste your time, the Gold and Silver Junglers I had when I got placed this Season were 300x better than any Jungler you'll find on your team in Platinum.

It could actually possibly be the fact that the game saw that I had a 90% WR in Plat and is just trying to make me lose purposely? Seems a bit unfair in my eyes. When I was in Gold, I consistently got autofilled, secondary role, but would still win regardless. Everyone plays okay, and then just one person on your team loses the game. Yeah, I feed sometimes but like actually look at my match history you will rarely see a jungler that's doing relatively good.

All of this tilts me pretty hard and I just lose momentum in my climb and get worse at the game the more this goes on. My CS had jumped down to like 5 cpm which is absolute garbage for Plat. I can't even untilt myself because I get untilted and then get back into a game, lose, and then I'm just back in the loop.

Share thoughts because I think matchmaking is pretty unfair at this point.

Also, why is it okay for a Caitlyn to rush IE and then 2 shot me at 9 minutes.

DON'T HAVE TO READ THIS: I'VE HAD 2 WINNING JUNGLERS OUT OF THE LAST 10 GAMES.

1/7/5 Karthus vs 13/2/2 Rengar 8/3/5 Graves (KDA player btw) vs 9/2/3 Nocturne 3/8/8 Xin Zhao vs 12/4/9 Warwick 3/8/31 Nunu (Good) vs 2/11/19 Warwick 7/10/14 Nocturne vs 9/9/13 Kayn 0/7/4 Karthus vs 4/3/0 Xin Zhao 2/9/5 Nocturne vs 5/5/6 Sejuani 8/7/11 Evelyn vs 7/6/6 Rengar 4/7/9 Lee Sin vs 7/5/8 Rammus 7/10/7 Xin Zhao vs 11/7/26 Lee Sin