I'll share with you something I use time and time again with babies & friends...
I remind myself that I wouldn't wish my journey on anyone else, especially not someone that I love.

Good friends accept that this is hard on those still waiting for that blessing. It's important that if you want to tell them you're not coping, that you do it with love and then they won't feel like you are pushing them away because of what they have rather than the fact that you desire to have the same.