While I agree that it is nothing to be ashamed of, I understand where these other moms are coming from. It's hard to be treated different just because of what happened many years ago. For myself, it has been almost ten years since my son was born, but no one lets it go. Mental math is done a mile a minute when anyone finds out my age compared to my son's age. A child of that age at my own age doesn't seem abnormal, even though technically, I was still a teenager when I had him.
Teenage motherhood is a fact of life that no one seems to accept yet.
It has also been around for longer than anyone thinks. Our grandparents used to get married as early as fourteen and have children right after. But sometime during the last century, someone turned teen pregnancy into a bad situation. We need assistance, not cold shoulders. Let them call me one.