You have received wonderful empathic replies camberwelle, and I hope they have given you the support and strength you need to face your current situation. I have a friend , similar to the one Kittylester mentioned, who despite having three AC, for various reasons will never be a grandmother . She is almost a substitute granny for my three, and is involved as much as she can be in their lives and loves to see photo's etc. However, she's that kind of woman, and now this post has really made me stop and think that surely must hurt her at some level that she can't enjoy her own grandchildren, but you would never know from her demeanour.
I have four AC, My son married a much older woman who already had a grown up daughter , so they must have decided right from the start there wouldn't be any more as they have been married over 12 years now. I do feel sad for him in some ways, as he once mentioned, when their relationship was going through a rocky patch that he had missed the opportunity to be a father . However I had to point out that he knew this when he entered into the relationship. My youngest won't be having children either , the middle two have three between them. One being a " miracle " as she was told there was no way she could ever have a child .
Sorry I'm digressing , what I really wanted to say was take heart from all the lovely messages here, and when your friends produce all the photo's of the grandchildren, smile and then whip out some photo's of your own, maybe a holiday or recent break you have been on . Finally , sometimes being a grandparent isn't the pretty picture that's often portrayed. Lots of grandparents face stress and sadness due to family disputes and other issues, and that can be almost worse ! Take care and hope you have been helped in some way by the lovely replies .