If the fate is bad, can you change it by learning Buddhism?

Nowadays, many people have learned the Four Commandments of Fanfan, and many others learn Buddhism to change their lives. However, most of them have not changed. First, they are insincere and purely for their own happiness. Second, they failed to really change from the heart. Third, they did too little. It's hard to change their lives. They must make great efforts, work hard and really change their hearts. If they change their minds, their lives will change.