What is our mission

Once,I was sad and walking in the street alone.I was thinking why we lived on this earth and what was our mission to do.I couldn't see a deep hole in front of me and I fell.I hit my head strongly and when I opened my eyes I was in the hospital,lying in the bed.
During the time when my eyes were closed and I was unconscious,I traveled across the universe.
First,I was in a cloud.It was a vast,misty place where you could hardly see how raindrops were walking with their beautiful,white skirts.I stopped one of them asking what was her mission and why god created her.She answered with a huge smile:"My mission is to be happy".I couldn't understand and asked her for explanation.She told me: "I am strongly in love with the earth.I grow here in the clouds and this love becomes stronger and stronger with the time.I can't wait till I'm old enough to meet my love-the earth. Usually when it's time, we drops are in a hurry during our travel in the air to reach our earth quickly.We know there we won't be raindrops anymore,there we gonna die by the sun,but we are so happy to see our love-the earth that even don't care if this meeting will kill us.So my mission is to meet the earth and be happy for this.Then I don't care what."
Then I met the moon and asked what was the meaning of his life.He told me his mission was to be happy.Love was the reason of his happiness too.He was lighting the dark just because he was strongly in love with the sun and he wanted the sun to sleep and rest at night.So he decided to light the nights.He can't light brightly but he does his best for his lover and he is happy.During my travel I was in many places,even in the ocean.There one little fish told me a strange sentence:"My mission is to swim.To swim it means that I am alive and I do everything to be alive.When you are alive it means that you are happy."I rejected her opinion and told her that when you are alive you are not always happy,but she added:"When you are alive,you are happy,because you know you have time to change everything and this possibility makes you happy".Fish is silly and can't realize that swim is something which makes her happy and she likes not swimming but happiness.
But what is right?Are we happy when we are alive or are we alive only when we are happy?
I opened my eyes and realized that my journey was ended.
Is happiness made with love somebody deeply like raindrops do and live with hope like a little fish does?
And people,what is your mission?