D.W.
Hi V.!
My son, now three, was the same way. I couldn't teach him anything. He was so... stubborn. He is a very strong-willed child I was told and he'll do it when he's ready. Sure enough. I would work him him on something and get frustrated so I would stop and a day to two later he would just do it like he had been all along. ERR!!!
My aunt had me freaked out about Autism too. She has an Autistic son and had given me all the signs to watch for and I started seeing too many things and talked to our peditrician. She said boys are very different from girls (we have a daughter 14 months older) and that with our son being so strong-willed everything was going to happen on his time and when he is ready, not a mintue sooner. At three he is a little better, but it's mostly come down to warming up to certain people.
My advice is really to relax and enjoy your little guy. He'll get all those things. Every baby is different and every Mom has a different story to tell.
Take care.