Dreams are residual activities of cerebral cortex, which can better reflect psychological changes in daily life, even physical health, but can not determine a person's fate or happiness.
If you often dream of dragons, tigers, phoenixes and turtles, it may be because the images or related legends of these animals have left a deep impression on your subconscious, or these animals are common in your daily life and easy to appear in dreams.
In a word, dreams are common psychological phenomena in people's daily life, and can't determine a person's fate or happiness or misfortune. If you have any other questions or doubts, it is recommended to seek professional help.