Quick, sell the car and then tell the story at work about how weird it was that the guy that bought your car could have been a brother. Just never be seen in that car again.

>She always joked about me not being experienced enough sexually.

What is the "joke"? Does she believe in sexually experienced virgins? She sounds like someone who doesn't know WTF she wants. I think you shouldn't form serious relationships with people who make jokes about subjects they "do not take casually". That's a red flag.