Getting depressed .

I don't know how to feel. I've had to miscarriages one in 2013 & one in 2016! We've been ttc since jan & i know it's not a long time but i feel like im getting depressed! I dont understand why my body can't do the one thing it's supposed to do! I've prayed so much for a baby . i can't help but feel jealousy when someone in the family announces that they're pregnant ! I feel helpless !