31, not married, and childless

I turned 31 recently, and I didn’t expect it to hurt so much. I know that may sound a bit dramatic, but I’m finding myself grieving over the deep belief that I would have been married by now and starting a family. I think one of the hardest parts is seeing everyone around me get married during my mid to late twenties, and now seeing everyone having kids. I can’t help but wonder if there is something wrong with me. My boyfriend and I have been together over 4 years now. He knows this is what I want and how important it is to me. I am starting to really wonder if we want the same things. Which makes me even sadder thinking maybe I spent too long waiting in this relationship for something that was never going to happen. I feel a bit melodramatic at the moment, but I had to get this off my chest.