Answer:
The more you have me the less you see. Shine a light on me and I shall flee.
You hold my tail while I fish for you. What am I?
I grow up while growing down
What is easy to get into, but hard to get out of?
I am constantly overlooked by everyone but everyone has 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.