bad playing or bad cards?

[BigBiceps]

Both.

Preflop, raise or fold with KJs. Open limping in early position is bad IMO.

Flop is fine, but another possible line is to make a smaller bet for a multiway pot with your draw, but you don't mind winning it right there.

Turn you are now heads up and out of position and the board has paired and you could possibly even be drawing dead. I think that a check or 1/3 pot bet is good here.

River, not much else you can do at this point.

Guess you lost to a full house or quads, although you don't post the result.