I feel you got married for all the wrong reasons. Marriage should be about love, and wanting to spend the rest of your life with someone because you can't imagine life without them. That sort of thing.

You got married because you felt it was something you should do because of your age. Why should age even be a factor in marriage? I would take some time to examine exactly how you feel about your wife and if you truly want to spend the rest of your life with her.