Ideally, sex education would be thorough enough in all schools that old sexist tropes about female anatomy would be quickly dispelled, and we could move forward in accurate and unbiased knowledge. Sadly, there are a log of gaps in the American education system, and what you learn and internalize about your body ranges greatly depending on where you went to school, and who raised you.
For many years, there was a myth spread that women's vaginas got "looser" the more sex they had. Oftentimes this myth was used as a tool to shame women out of pursuing pleasure, or perpetuate the obsession with virginity. Well, to make a long debunking short, this just simply isn't true. Having sex itself doesn't change the structure or looseness of the vagina, and even the affects of childbirth can be healed up after months to a year.
Besides that, getting older is a natural process, and all body parts will go through changes! There is nothing wrong or shameful about that, and the way women are put under the microscope for the look and function of every body part is wildly dehumanizing.