Depressed and under 18.

I feel more depressed. I look happy when I go out with people that pretend to care, I buy clothes, I don't complain. Sometimes I do feel almost happy. But I feel depressed all the time. I almost got into a car accident today and for a second I wish that I had, but I would never want to intentionally harm my "friends". I can't stop thinking about it. My head is spinning, my chest is heavy, it feels like I can't breathe.