Answer:
lighter than feather and softer than silk yet the strongest man in the world cannot hold me for more than a few minutes.
I produce wool and spit a lot
Teenage girls are pros at creating me. Learn me in classes.
I have a little house in which I live all alone. My house has no doors or windows and if I want to go out I must break through the wall.
I have an eye but cannot see. I take time to generate and can dissipate in seconds. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.