Honey, no one here is trying to make you out to be a maggot. I just know that you're very young and probably see everything in black and white. You just have to realize that there are many grey areas. Young people (yes, I WAS one) seem to take everything too seriously. From what you're saying here, we are to believe that, for some obscure reason the librarian has taken it upon herself to make your life miserable. Now, I have to ask, why?
You have already said that you've made up your mind to hate her, so maybe you're not seeing events clearly. That's one reason to ask your mom to go with you once or twice, so that she can sort of check out the situation.
And believe me, if age had anything to do with it, I would be a genius by now, but I'm still just plodding along like every one else.