How were women my age ready for motherhood many years ago but I'm not ready?

I don't feel ready at all for that life changing event. If I were to get pregnant right now, I would be freaking out and probably finding the nearest clinic to end it. I wouldn't want to continue a pregnancy.

Many years ago, a 19-22 year-old woman was already ready. She was a full grown woman not just physically but mentally too. My mind still feels childish. Why am I not ready like they were?
Updates
1 y
I don't even have desires for a kid like they did at that time. Many years ago, a woman my age already had those baby urges I'm lacking.
How were women my age ready for motherhood many years ago but I'm not ready?
Post Opinion