You can't be sleeping in your car at your age. I did it afew years a go at weekends for a month. It was cold and miserable. Go to the local YMCA if you can't afford a cheap hotel. Its about £15 a night.The last time I slept in my car we lost 1-4 to Brighton. I don't want to be a Jonah but I'll be sleeping in my car again tonight!
Honestly in the morning you will absolutely ache from head to toe sleeping in your car
Be careful if your drinking as well . You will get done for drink driving.
Can't you sleep on the sofa at home?