Then you learn how to lose lane gracefully and farm up.
In bronze/bronze it doesn't matter if the enemy laners are killing you, they will probably not do anything with that advantage. A gold player may per say push the lane so that the wave gets bounced and you lose loads of minions, but in bronze they'll go back for literally no reason, even if they have no real way of dying (if they're low that is). A kill is only ~12-15 cs. If you're 0/3 and have 200 cs at 25 minutes compared to the enemy laner who is 5/0 and at 100 cs you're still beating them in terms of gold.
As an ADC if you want to carry a game forget about doing the low elo tradition of ARAMing at 15 minutes. Let your team die 20 times, as long as you're constantly applying smart pressure (that is pressure that can't be punished by you getting caught out) and getting farmed up you will reach the event horizon in terms of damage that allows you to solo carry the game. Aim to have atleast 6CSPM and you will get out of silver. I think the most important step in becoming better is understanding that you did not lose that game because of your team, but yourself. If you swapped out yourself with a challenger player that challenger player would 99% chance win the game. You say that you got clown fiesta'd 4 man ganked? Well you should've noticed that mid is missing or that top still has TP and you should refrain from going in. Or even better, freeze your lane at your tower so that you can get free farm. Whilst at higher elos freezing your lane is literally causing the game to become a 4v5 because you can't leave the lane as you will lose farm, in lower elos it literally doesn't matter because nobody is going to capitalise on that.
I think the best way that someone explained your chances of being able to carry was this:
The enemy team has a 50% chance of having **** players, whilst you have a 40% chance of having **** players. If you truly are better than your elo you should be able to carry 60% of your games even if you're a statical engima that always gets bad teammates.