I was terribly losing a live chess game, but I finally won with this mate in 3. I hope you like it. It's not a very hard puzzle.

why do i never get as much luck as this...

Maybe because you play higher rated opponents, or you don't blunder against lower rated opponents, or maybe you're just unlucky, or you resign when you are in a losing position. I normally resign in a losing position too, but I saw some mating chances, that's why I continued playing.

a nicer veriation is 1.Bg8+ kxg8 2.h7+ kxg7 3.h8=Q#

Hehe indeed, I didn't even see that. Thanks for suggesting.