Answer:
I belong to everyone. Sometimes make you happy, sometimes make you sad. I will never end until the day you do. What am I?
By Moon or by Sun, I shall be found. Yet, if there's no light around, I am undone. What am I?
I have wheels and flies yet I am not an aircraft.
I am the thing that is used to make your weight. What am I?
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. Amidst a light brown grassy lawn with an outline of a green grass.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.