First of all, Buddhism is neither pessimistic nor optimistic. If anything at all, it is realistic, for it takes a realistic view of life and the world. It looks at things objectively (yathābhūtam). It does not falsely lull you into living in a fool's paradise, nor does it frighten and agonize you with all kinds of imaginary fears and sins. It tells you exactly and objectively what you are and what the world around you is, and shows you the way to perfect freedom, peace, tranquility and happiness.
YOU ARE JUST You are not just for the right or left, but for what is right over the wrong. You are not just rich or poor, but always wealthy in the mind and heart. You are not perfect, but flawed. You are flawed, but you are just. You may just be conscious human, but you are also a magnificent reflection of God.