"The important thing in the Olympic Games is not to win, but to take part; the important thing in Life is not triumph, but the struggle; the essential thing is not to have conquered but to have fought well."
-Pierre de Coubertin

Ponder upon that before you start another match of Dota 2 "just to have fun".
Stop fooling yourself into thinking that not bothering to try and play well lets you have fun.

You've never had fun in a game where you went 0/10/2 and you know it, so why bother?