Good Riddles

Question: Everything is what it is not, but everything is not what it is. So what is everything?

Question: Ive said 'I am 11 years old' however, I'm 21 years old. How is that possible?

Question: Alive without breath. As cold as death. Never thirsty ever drinking. All in mail never clinking.

Question: What glass protects you from the sun but does not lets you see near?

Question: What is green, fuzzy, has four legs and if it fell out of a tree could kill you?