My girlfriend (19) is the first ever virgin I dated in my life. Since she is still a virgin and new to sex stuff we take it very slow. Today I finally went down on her and gave her cunnilingus. It’s not my first time and I have done this multiple times. In fact, cunnilingus is my favorite kind of foreplay. She likes and enjoys it when it comes to her clit. But when I move towards the opening of her vagina she told me it hurt. She never put even a finger inside of her and masturbated by grinding her crotch unto her pillow. Did I do it wrong?