You could also say you're an overdramatic League of Legends player.
When I lose, it doesn't really bother me that much, I'll be the first to admit. However, that doesn't mean I don't TRY to win, because I do LIKE winning. I'm one of those people who can't stand being shit at something, it's how I got so good at this game so quickly, but that doesn't mean I'm some melodramatic guy flipping out at my teammates if I start to lose.
Newsflash to you, in my experience, my teammates only say this when they're getting flamed at by some salty ADC. It's a way to deflect the insults.
My advice? If you're getting told this it probably means you need to chill and stop chatting.