I cant cope anymore!!!

Since I had my miscarriage last year my world is just upside down. Im thankful I have an amazing man and a job that i love but all my friends have been announcing their pregnancies whilst I have to pretend I'm nit hurting. I actually just cant be happy for them as I can't be happy for myself. I wish it was me thats pregnant. Why isn't it me? I really just can't cope. My friend has just messaged me to tell me and i really just cant text back at the moment. Im so tired of feeling this way