I had cancer, too (Hodgkin IIIa), and I always thought "What did I do, why do I deserve it?" This question made me mad and is still keeping me busy. People who say that someone "deserved it", are like fuel to that fire.
Luckily I successfully got rid of that disease. Although I couldn't do my military service, which I was looking forward to since I was a 13 year old boy, things are going to be alright. I'm in the 3rd semester at the university now, because I finished school during the treatment. As you can see, nothing is impossible, if you really want to.
A good thing in Germany is our medical system. Though my parents have enough money, I would have gotten my chemo even if I were from a poor family, because everyone has the right to get the best treatment for every disease, no matter if he's unemployed, a foreigner or old. Even people with no money have an insurance, because it's the law!
Congratulations to everyone who fought cancer, good luck to everyone who is still fighting and good health to you all! Our health is the biggest treasure we have.