My one year old is way to stubborn and I am begining to worry..?? ?

I know that babies are always a little difficult, but my son is beyond difficult. Its not that he is a bad baby because he isn't its just that if he doesn't want to do it he won't. There is no coercing him into it or bribing him. Take for instance I like to work with him on the words he knows, like baby, mine, mama, daddy, byebye, and you should get the picture. The problem is that unless he wants to say thoes words he doesn't and he hardly ever says them in a questioning way. He just starts of on this long rant about momma or the baby and thats about the only word or words u can understand. When you try to get him to do or say anything he looks at you like your nuts. He doesn't like sitting still he doesn't like an organized activity. Unless its in music, he loves music and songs. Take for instance I bought him some tadoodles crayola markers so that we could beging trying to delvelop his fine motor skills. Now most babies would love to get a hold of a marker and go town but not him. He just stared at it and then ran off. I have seen other babies his age and they seem better able to artculate what they want with their parents, christian just doesn't seem interested in communicating with me. I know he understands me because he clearly indicates on a regular basis that he understands the basics like yes, no, his name, up, and bite(food) just to name a few. I just don't understand why he does this. I mean is it because I have babied him to much? I don't think I have, we have been very firm and we reinforce what we say to him, he is disciplined appropriatly when he does something wrong. I do love on him and read to him and sing him songs he likes to play games too. However the only things that interest him and I mean really interest him, are music and music instruments, and anything that turns or opens and closes. Like cabinets, knobs, steering wheels, wheels on anything else. He focuses on thoes things all the time. Someone please tell me if this is normal, or what cause I am begining to believe that I am doing something wrong.