Why do I feel this way am I the only one?

so I am 19 years old I have ben with this amazing guy for 5 years and we are getting married on feb. 12 2011 and I have this felling that I want a baby and have had it a long time now and I fell like I am alone and no one ealse understand how I feel I am ready for a baby and so is he I know it will happen with due time but I feel left out everyone around me has a baby or is pregnet and that hurts me and I don't understand why I am feeling this way I am starting to not go around my friends that do have babies because I don't and I don't know what's going on with my self if anyone could give me any clues I would gratley aperciate it matucher answers only thank you you can instent message me at cattie_hart@yahoo.com for more dets thanks