Dear Marksman
I've felt this way since I learned the game in S4 (started S2, but had no idea wtf was going on or undrstood the game until about mid S4 lol).
All you need is farm! If your support gets the kill, good for them, that gold will come in handy for them. The majority of your gold should from CS.
CS > kills
Which is why I don't mind having
as support because I know she isn't going to touch my farm and can kill secure kills for those slippery enemies so I can get an extra 2 minion waves worth of gold.
To make it clear for you as a top laner main, I've been behind 2 deaths as Irelia, but had my gold than my 2/0 opponent thanks to being up 40 farm (shout out to Irelia Q lol). He gained 574 gold by killing me twice in a row, I have an extra 798 gold for being 40 CS ahead.
Meaning I have a 224 gold advantage which only increased as he focused me for the 3rd kill and I increased minion farm by 50.
Then when I finally killed him, bonus 360 gold. Then I steamrolled from there.