What should I do when...?

Right now I'm struggling with severe depression and clinical anxiety. My mom draged me off to a church picnic with her when I told her I COULDN'T come. My depression and anxiety are som bad I was removed from school and can't even go ut to eat. I beegged my mom to take me back home she said I would have fun. The only thing I find fun is sleeping, one, I'm a teenager and two, I'm depressed. So right now I'm sitting the ****** hot car crying, I don't know what to do. I'm about to just leave the park and just keep walking, I'm several miles from town. Or should I just stay in the car and wait out the entire 3 plus hours event? I'm a 14 Year old girl.