Answer:
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
I am the only word that looks the same when spelled upside down.
Sing me to a baby about to go to sleep.
You went into the woods and got me. You sat down to seek me. You brought me home with yourself because you couldn't find me. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.