It looks like you might have taken cs, how ever given the number of deaths on your team it could be you just csed when solo in lane. If you used ability's or pushed lane instead of a freaze and lh that's a bit of a misplay in games your playing from behind in.
On the topic of not feeding first I have to disagree, So you did give up FB, thou your adc got a kill a moment after so looks like it was close but that's still a gold lead for their adc, Then you went ham got zed which is not a bad thing but promptly died again after, only 3 min later, then in another 3 min you died a 3rd time, 1 min after that its a 4th time. then in 2 min you died for the 5th time, and 60 or so seconds later you hit your 6th death at the 14 min mark. comparatively your adc had 4deaths, your mid had 2, your top was 1 and jungler died 4 times a bit after you, and got himself a 5th death a min later at the 15 min marker but still less then yours mate.
If your really wanting to climb outta bronze you may want to spend a bit more time focusing on how your playing, Example, if your the most aggressive person on team some games you need to dial it down, If you don't get follow up then don't keep picking fights, peel.