Infertility in my early 20s

So me and my husband have been together for 4 years now and have been actually ttc for about a year now however we have never actually used birth control, ever in all four years! And to no avail, I continue to see friends from high school getting pregnant without even meaning or trying to. It’s both baffling and depressing and I don’t know how to deal with it. These people are my friends and I’m so happy for them I just don’t know how to cope with going on Facebook with all these pregnancy announcements and none of them being mine. Does anyone else feel like this? How do you cope with the emotional pain?