How do I shake this feeling

Kayyyy
I had a miscarriage December 2014 and it wasn't a planned pregnancy my birth control failed but we decided we wanted the baby snowy as and then 2 weeks later we got the devastating news . But recently and over the last few years so many of my friends or people in entry to school with are having kids some are on there 2 or 3 and my boyfriend doesn't want baby until we are more established and although this is the responsible thing to do it literally hurts my heart and gives me the biggest pit in my stomach easy time I see a new person announcing pregnancy and I have to wait . How do I get over these feelings ? It's almost more than I can handle some days .