I am so sorry you're feeling this way. I'm sure a lot of us here have been in similar situations so take a deep breath and consider all your possible options.
Have you tried counseling at all? DH and I were in counseling a couple years ago, for an unrelated issue, and the baby argument came up, and I am so glad it did.
Hubby wanted to keep putting off the talk and kept saying we were still young and had plenty of time, blah blah blah, etc. Once we discussed it with a therapist, we determined that hubby thought that I was pushing for a baby right then (which I wasn't, I just wanted a timeframe idea) and would panic and shut down. I thought that he didn't want kids at all because he wasn't willing to talk about it, which also wasn't the case.
Once we figured out that I was willing to wait another year or so, and that he wasn't against having kids in the next few years we were more easily able to talk about it and come to a compromise.
I'm sure you've heard this before, but communication is so important. If you haven't already, schedule an appointment with a couples/family counselor and discuss it with a neutral third party. Sometimes you just can't successfully have that conversation without a mediator to help you understand each other.
Also, I don't know how old you are, but enjoy your time together if you haven't already. DH and I are mid-late twenties, and have been married for over 4 years. I truly love him more now than I did even a couple years into our marriage. Cherish each other. Remember why you fell in love with him in the first place.