Is the following paragraph correct?

A child's smile, so natural and earnest, sometimes envy me. There were days when i was incognizant of self-seeking and dreadful people.I had a grin too on my face. But now when i am all grown up and and earning my own bread i understand that the world is not an utopia. I have always beleived in philosophy 'live and let live', but the people around me are always looking for a chance to poke me. They goad me whenever they can. Some people even conspire against me. They will intentionally share others flaws and will provoke you to say some.Then they will go to others and talk about you the same way. They will make you a scapegoat for their cruel intentions. The world isn't pleasant as you beleive. To survive in this world you just can't be a saint. You have to be witty and shrewd. Before beleiving others think twice. But at the same time stay yourself.