Did I play this wrong?

I played in the biggest tournament I have ever played in (not too big reall). I was down to around 4300, the blinds are at 300/600. I was 2 off the button and looked down at pocket kings. I raised to 1800. Table chip leader was in BB with about 12K. He raises me all in. I call. He hits a J on the flop for a set of jacks. I'm out in 64th place when the top 54 paid.

My friend says I should not have put all my chips in when I was so close to the money. My thinking is that I had to win one more hand to blind into the money, and I just could not lay down those pocket Kings pre-flop. Although the money would have been my biggest win ever, I had no problem with my play and would do it again, but my buddy has put a little doubt into my head. So what do you guys and gals think?