Sorry for your loss. I lost my baby at nearly 21 weeks just over 2 months ago. I couldn't see at the beginning how I could ever function again - the loss was utterly crushing. But bit by bit I have started to regain myself. I went back to work after nearly 4 weeks - the first couple of weeks I was useless - but have slowly found my stride again.
And although I have found each new thing an ordeal (the first time I took my eldest to school after the baby died, the first kiddy birthday party, the first family wedding etc etc), I gained strength each time.
I will never be exactly the same person I was before Jai died, and you may find that's the same for you too. But you, the person you really are, is still there and will come back to you in time. You need to look after yourself, and let yourself grieve.
I agree with Squonk. I found loads of people I knew had had miscarriages. And I found all those people such a support to me. It made me realise that most women don't have it easy in pregnancy, and that for every baby you see, there's often a lot of loss that's gone hand in hand with it.
Having said that, I do understand what you feel when you see other women with babies. I reacted very strangely after I lost Jai - I kept looking at all those other women wondering if I should warn them that their babies could die. Mad, I know, and I would never have predicted that's how I would respond. And it isn't suprising that you feel envious of other women but I think one of the reasons why is because miscarriage is so hidden.
From the outside it looks as if I've had it easy - I had 3 babies in 3.5 years starting when I was 33. But you can't tell from looking at me that I had 10 years of infertility before that and have recently lost a baby quite late on.
But don't be too hard on yourself. It's normal to be on the emotional roller coaster after a loss like this. Look after yourself. I'll be thinking of you.