Open Question: How do you cope with depression of not having a child of your own with the man you love?

I am 24 years old, everyone around me has a child. I have always felt angry and empty Every time I see her mother. The man, I want to get married to have children well, we have been working hard, but it is dressed in our relationship. This is not someone else's child, I would like that sort of thing too many things that it, otherwise I can not describe …