Look more closely, it is there somewhere.
Nothing about sex with 64 or 54 or 56 guys.
Nor is there anything about that elsewhere in the yearbooks.
And why would she write that she had sex with 54 or 64 guys between high school and college if she was still in high school?
It makes no sense.
That story came from a tweet you can see embedded here.
The guy who wrote the article about yearbook didn't even get the number right, though it didn't matter because it's a fake story.
Now ask yourself how the anonymous tweeter was in any position to know what she told her friend or how many men she had sex with.
How likely is it that he knew what he was talking about?
And why twitter it to Brian Stelter, rather than to somebody who might actually investigate the rumor?
You can have been wrong about this without your whole world collapsing.