Why are drivers so bitter and tired that they can't make much money? Every day, I have backache and cramps when I step on the clutch and my legs.

Not all drivers are short of money, not all drivers are tired. Depends on what you pay attention to. If you pay attention to money, you will be very tired. If you commit suicide for comfort, you will drive less. Have a good life. Your reason is not painful, and life is different. I think driving is good. Whether your life is happy or not depends on your heart. Good luck.