It sounds to me like you have a desire for something big and important to happen in your life and have simplified it to "car crash". I went for awhile after school when I was working at a dead-end job where I kept imagining crashing my car into a cement bridge support on my route to work. I suspect I was wishing for big "change".

I think your thinking is akin to a daydream; someone might dream of a tropical island when they want to get away from a job, that sort of thing. Were I you, I would look to see what "car crash" represents to you, carry the fantasy to its completion and see what you end up with? I use to also fantasize that I was driving across a bridge that collapsed into the water and had a niece or someone in the car, got myself out and dove for my niece and had to swim us all the way to land, almost didn't make it -- it was a long, drawn out fantasy but the upshot of it was getting the attention of who I wanted and tangibly seeing how much those who care for me did, etc.

It's hard when you are a teen and fairly "trapped" between home and school! I would take on a project, do a lot of reading and see if you can figure out some of what interests you, where you have aptitudes or what you don't like but might need (math :-) how you get along with computers, etc. and see if you can't work toward something that interests you beyond the next 4-5 years? If you are going to go to college, what subject are you going to study, what do you want to work at, do you want to have a job during school and what would you do with that money (help pay for your education, live on your own with others, buy and support a car, travel) or do you want to study harder and finish early so you can do the next phase of your plan; do you understand money and how to make and use it effectively, etc. You aren't always going to be a teenager and I think finding something to get interested in and work on will get rid of the car crash interest and let you use that energy to get somewhere you would like better.