Bad play or just unlucky.

[two_dogs]

Party 20+2 sng

6 handed
Blinds 25/50t
I've got 845t in chips w 5 [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/diamond.gif[/img]

UTG folds, I limp, 2 folds SB completes BB checks.
FLOP comes K [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/heart.gif[/img]3 [img]/images/graemlins/spade.gif[/img]
SB checks BB checks I bet 50
SB folds BB puts me All-In.
I didn't have any read on him but I couldn't wait to shove all my chips in. I didn't even give it much thought. I had him on a K with a decent kicker.
HE had a King alright and his brother. So I went bye-bye.
So where did I go wrong?