Hey I know the feeling, I am a support main I had every lane feed for two weeks until I got demoted instead of promoted. I clawed my way to 99LP... then I went 2/13 and was demoted.
I can't really stop my mid or top lane feeding horribly to the point it is actually impossible for me to stop my adc getting one shot but 10/2 mid lane annie or how the hell do you peel a 10/3 Akali?
Then I quit the game... I'll probably never play ranked again.... it is just not at all enjoyable... and people wonder why no one plays support.
I can't work out how, if I never feed, then why do I have the feeders on my team?, probility is in my favour there.
I thought for sure I was good at this and that since I am the only common factor it must be my fault, that I have to practice to get better at it but that kind of thinking leads to madness and depression. Because I can't play any better than I already am and i don't think there is anyway for me to change the tide of these games, without any idea of how to change the tide of these games i gave up rather than go mad.