Thanks to both of the kind people who responded to my post. 2 different viewpoints, both thoughtful and constructive. I am sympathetic to my wife, and I would love it if she would even go for a walk. She finds time to be a Pampered Chef consultant, to participate in MOPS and other women's groups, and all of her friends think she is a great friend -- and she is.
Honestly I think sex is just not her thing and it kills me that it started practically the day we were married. I always thought the intimacy of a "soul mate" would be part of marriage. I have had a few people in my life that I really connect with -- none that I dated because they were always in a different status of life than I was.
At this point, as SD pointed out, there is a lot of water under the bridge. I feel like my chance for happiness is gone and the best I can do is keep my kids from the same fundamental mistake I made -- I just wish I knew what that was? Probably getting married at 21 was just too young, but it sure didn't feel like it at the time.
NHTom's point about authority is an interesting one. My comment about both being firstborns was my way of indicating that I am married to one stubborn woman and the lack of mutual give and take has always been a part of it. Well, W is right here so I need to click send.