Why do dreams fail?

Dreams fail because people don't have that strive to make them come true. In the book Crook says that George and Lennie's dream won't come true because he has seen so many men who have wanted the same dream, but have ended up just working and alone. Crook thinks that this will happen with George and Lennie until they say that they have a place in mind and have money. This makes Crooks rethink his statement and he thinks that maybe George and Lennie can pull it off. I have had many dreams that haven't come true like i wanted to be a professional soccer player. I have had this dream for awhile but it won't come true because i don't have that strive or determination for it to come true. I have been thinking that being a professional soccer player is something that i don't want to be when i am older. Some people have dreams that they know on't come true but they dream it anyway. I think people do this to have hope and be happy because they think that their wildest dream will come true. But people like me have other dreams and the dreams they once had know that they won't ever happen so they stop trying and believing that one day their dream would come true.