What do you mean by someone saying that I will have a mass annihilation in the future?

That means you will encounter that kind of bleeding accident in the future. In fact, these are all superstitious statements. Don't trust them. How did this happen? If it is fate, what's the use of that person's efforts? There are a lot of vehicles now, and there is a great possibility of accidents. If you pay special attention in the future, you can avoid this kind of accident. Also, don't fight with others. Fighting is always prone to this kind of injury and bleeding, which is what people say. So I hope you take care of yourself, work hard, and don't do those bad things in the future, so that you can avoid the disaster of mass annihilation.