Answer:
Sometimes you feel it weigh a ton. Yet it is nothing, but somehow still there. Makes you uncomfortable around anyone, But speak its name and it's gone.
What can be any size or shape and gets bigger the more you take from it?
What can be seen but not touched?
What has a head and a tail but no body?
I start in little but I end in full, you'll find me in half and complete.
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?