Wanting Pregnancy.

I have not wanted anything more these past 4 years of my life then to have a child. I have been with the same man for 6 years. We live together, make amazing money, are great together, talking about marriage,etc. I keep asking him when we can have kids. He says if it happens it happens but he doesn't WANT them at least not right now. So to make it harder to have one, have rarely have sex. I'm not on the pill. I see all these posts about the positive tests and it makes me so much more depressed then I already am. My best friend has 2 kids and my other friend has 2 and 1 on the way. I just wish I could have one of my own.