When my son was 2 1/2 I decided it was time to start potty training. We tried it for one day, and then my son said, "Mama, I don't really feel like doing this. I'll use the potty when I'm three."
I figured that if he could articulate it that well, I'd wait til he was three. The month before he turned three, I kept reminding him - "You know, when you're three, you have to go on the potty" - with every diaper change!
The day of his third birthday, I said, "You're three now, Cade, you have to use the potty." He said, "I know, Mama." And from that day on, he just went to the bathroom. It was wonderful! The only "training" I had to do was to show him how to wipe properly.
Your son will get there, give him a little more time.