I really need to stop thinking the game is over at 10 minutes.

https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2700561278/33585810?tab=overview

In this match I am Jhin into Trist. Trist starts snowballing off my support and next thing I know she is 8-0. Immediately I am ready to give up so I start and early surrender. Team votes no and I am annoyed because there is no way an 8-0 Trist could lose when the games are so quick and decided so early. Well she did end up losing and I ended up out damaging her, having more kills/assist than her. Even though it is easy to get in the mindset (especially if you listen to the boards) that matches are won at 10 minutes, this isn't true. This kind of match, at least in my experience, is not all that uncommon. It was a hard fought win but it was a win nonetheless.

Matches are not won just because someone gets a kill lead. Even if it is an 8 kill lead.