C.H.
At my son's two-year checkup, our pediatrician told us that we'd be lucky if we had our son potty trained before 4. Don't know how he knew that, but he must've seen enough boys to know that all boys are different, and some are just too busy in other areas to focus on potty training. And, of course, doc was right about my son. His focus has always been on physical development. He taught himself how to do forward rolls unassisted before he was two years old. At two, he was a better soccer player than my 5-yr-old. He's now 3.5, and he will go on the potty, but we have to remind him constantly or have him run around with no bottoms on so he'll remember. Like doc said, I don't see getting my son finished with training before 4.
So, don't stress about it. It'll happen in time, but if he feels pressured, it may delay it further. Just make sure he has his potty seat there, and have him sit on it before he takes a bath or whenever you know he tends to pee. With my son, we started a sticker chart, and he knows he'll get a Cars cake when it's filled. He still uses his diaper more often than not, even when we remind him to go on the potty, but it has helped.
Good luck to you (to us both)!! =)