I understand what you're saying. Most of the time I feel like an imposter. I'm not doing a lot of parenting yet though...mainly just taking care of the biological needs of a little person.
I feel like other parents my age who have older kids look so much older than me. At our maternity wing tour there was a couple with a tween and I thought for sure they had a late in life oops. Nope. My age.
I wonder if people think that about my H. He went gray early.