Ranked unplayable

I was just about get plat 5, then I lose promos. But after I get huge losing streak which continued until i got demoted to gold 2. The problem is that I get teams where there are 3 shit players in my team and 1 decent and enemy is pretty much diamond smurfs. Usually it goes that if I play mid, Bot lane looses. If I play top, jungle and mid are bad and bot is shit too. If I play jungle, all other lanes lose. If I play bot, rest of team is shit or I lose lane because I'm getting camped by enemy jungler and my jungler is farming in jungle and feeding in top and mid. Any tips how to stop this?
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