Could/Should have I played this differntly?

[Matt Williams]

OK,so I am in a 7 player tourny. We started w/ $3,000 in chips and the blinds start at $25-$50. This is the 3rd hand of the tourny.

I am under the gun and see K-K. I raise to $600. The guy to my left raises to $1500. Everyone else folds and I move all in. He calls and shows A-A. I end up losing. My question is, I had assumed he had an Ace. Should I have just called and then hammer the flop if an Ace doesn't show? It did, and I busted out. Personally, I think I was pot committed once he raised me to $1500, but I am not sure. I may have folded once I saw that Ace, but I am not sure.