Don't feel like its ever going to happen

We've been trying for 6 months, and in that time 2 of my friends have gotten pregnant and 3 have had their babies... I feel like maybe I'm not meant to be a mom, maybe.I'm doing something wrong,... af shows her face every month right around the same day, give or take, I use ovulation test every month, I just don't understand, I want this more than anything... I thought maybe this would be our month but af just showed her ugly face... so I guess we'll just try again next month... any positive words would be great, I'm literally crying while I type this... thanks girls!