Answer:
Teenage girls are pros at creating me. Learn me in classes.
A young man wants to have me but when he has me he no longer wants me. Blade in hand he attacks me and does his best to remove me. Yet he knows that it is all in vain.
Whoever made me doesn't want me. Whoever bought me doesn't need me. Whoever uses me doesn't know me. What am I?
I always have to work with something in my eye.
A large oasis in the desert. Come with cash and leave with none. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.