First off, don't attempt to deceive yourself. The match you posted is far FAR better than your average game. You typically rack up a lot more deaths.
Second, they types of champions you play (melee ADCs and assasins mostly) typically MUST run away with the match of they end up as a detriment. You usually weaken your teamcomp with a lot of those picks, and need to make up for it by pulling ahead. So yeah, going even with those champs is often not good enough.
As Dr. Cyanide pointed out, your warding is aweful, like really terrible.
Advice: Dying a lot typically reduces your capability to carry a match. I know Bronze tends to be a tad... enthusiastic about fighting, but try to dial back the death-count a bit. You may find yourself being able to impact your games more when your not spending as much time staring at a grey screen. Either that, or try branching out to some champs that can carry without directly obliterating the enemy team. (Sion top, built as a tank, can win games just by being a brick wall that includes a Frozen Heart aura)
Final note: how do you buy a sightstone and place 3 wards in a 45 minute game?