Extended Metaphor

My life is like an ocean. Sometimes there are big waves crushing onto the shore or whirlpool twisting all the water into a big black whole. But sometimes it is like the Pacific, calm and tranquil, nothing happening. There are sunshine in my life, but also typhoons. The ocean is very big and endless, some as my life. I would never know when It will end. Life is very unpredictable, just like oceans. You can only see the bright blue surface, but never know what is deep inside.