Feeling like shit

The title says it all. My boyfriend and 2 other friends weren't at school because they're all sick, my period didn't come and it was supposed to, and just because my parents aren't gonna spoil me and buy me a car I heard some guy making fun of it. Yeah I know I totaled it and if I wasn't working to help my parents I'd have something else. It just all made me hate myself. And I keep crying. What is wrong with me?