What do I do to keep things whole?

To me, there are many things that have possibility to break our daily life. Some can be stopped, but other can not. Being run away by car, killed by psychopaths, killed in an earthquake and so on. This is what we can't stop. Saying horrible things to your parents, driving a car under the influence of alcohol, bullying someone and so on. This is what we can stop. We know these are very dangerous, but we think it will be all right or problems will not happen. The feeling to feel like that is not good for people and should be gotten rid of from the mind. Because of this feeling, I suffered. In September of last year, I injured near my right shin because of my carelessness. That time, I was going down a steep downhill by bike. Moved by interest, I tried to complete the downhill without brakes. I at that time was full of confidence and believed that I can do anything. That was stupid thought. My bike drove faster than I have expected and I was not able to endure the speed and fell down. I lost my skin of shin of the size same as 10 yen coin. The injury made me aware of my foolishness. Every time I see my wound, I can change my lazy mind. I hope not do the same thing again. And from now, I try to become careful for small things that can become a big problem.