Got a baby shower invite today

Okay so I got a baby shower invite today to a girl's shower that my parents are friends with her parents and actually I went to her wedding a few weeks before I lost my baby. I don't even understand why she would invite me knowing I just lost a baby well I guess it has been over 6 mos now. My husband thinks I am crazy but its not that I am unhappy for other pregnant people it just makes me sad about our situation. Its been over 6mos I am still not and probably will never be over the loss of our daughter Mia and I am still not pregnant every month is a let down and everyone around me never acknowledges the loss of our baby but I am supposed to move on and be happy for everyone else that is having babies even those in my husbands family who don't deserve kids who do drugs and who live off the government....smoke cigarettes when pregnant. Why does no one acknowledge the baby we loss, why should I be happy for everyone else who is having kids. Will I feel different when I get pregnant again or will I still feel this way about hearing of all these other happy pregnant people I can never go back to how it was before thinking everyone all has their perfect babies if they make it past 12 weeks of pregnancy with no issues.