I’ve had to send away twice for my birth certificate. Maybe you have the original from the time of your birth (tho I suspect what you have is the hospital issue). I was never given a registered copy of any of my kids’ official birth certificates, and had to mail in for them.
I used to have the original in my file cabinet- for like 40 years- until my whole file cabinet was lost in a move.
But I remember it clearly, used it many times for cub scouts, school, baseball, etc...