How do I cope with a miscarriage?

I miscarried at 10 weeks in October. It's eating away at me and I don't know how to deal with it. I'm hoping women who have been in the same situation can share how they grieved. My mother tells me I need to, but I don't know how. The baby would have been born June 25 and every day that pes brigns me closer to that date, and I can feel a break down building. I've already scheduled the day off of work, because I'm afraid that day may do me in. When I find out that people I know are pregnant, instead of being happy for them, I'm angry. SO angry. The father and I aren't together, but I swear, if one more person says "it's for the best", I may explode in a fit of rage. The only way I can describe it is that I feel like a failure as a woman. The one thing we are biologically made to do, my body failed at. I just don't know how to grieve for someone that never got to "be". Please help, because I'm tired of being so angry, but I don't know how to move on.