Guest
It seems that you worry too much. You have to work on your confidence issue on your own. You need more experience and practise.
I do not know about your area, but in the US you may take the driving test without going through driving school. You can teach yourself. The Department of Motor Vehicles provides all the necessary material you need to pass the written test and it is legal to practise driving on private property.
You should sell your current car and buy a really cheap hideous used car. It should be so awful that you would not care whether someone scratches it, dents it, vandalised it, stole it, set it on fire, throw rocks at it, ... etc..
Then practise driving on private property, such as a farm, to build up on experience. Next, get your friends and family to help you out. They can drive a tractor, drive a farm truck, ride a horse and buggy, throw rocks at you, ... etc. while your drive.
Keep practising until you develop nerves of steel, then go back and take your driving test.