I'm terrified of driving and being in cars
Why are you scared of cars?
I'm worried I'll get injured.
A lot of people have a fear of driving and being in cars, and it is okay to be scared of injury. You eventually should try to overcome this fear though, as it will help you to function in society.
But I have a panic attack just thinking about it.
I can see that the fear you feel is very serious, so it would be best to talk to a therapist about this.  As you probably know, your chances of being injured in a car are insignificant compared to the benefits, and a therapist can help you to gradually overcome your fear.  They will help you every step of the way, and you will be independent in no time.