Don't call all in without a made hand

Last night we had the office poker game, I made a critical mistake which ended my play.

I had A4, flop came 23x. so I had 4 cards to a straight. However when a co worker shoved all in I called which was dumb. If I had drawn an Ace or 5 I would have won the hand but it didn't happen.

The last thing you want to do in a SNG is gamble! a chip won is worth less then a chip lost.