Are you sure she would never think of dating you? Only in the friend zone with her? If it hurts to crush on her and always want more with her then it does you no favors to hang out with her a lot. Maybe tell her how you feel before you cut off any communications and friendship, that discussion with her will give you closure of some kind at least. No, don't quit school, I agree with her on that too.
“The world would be a nicer place if everyone had the ability to love as unconditionally as a dog.”