Is Life Really A Riddle?

Is life really a riddle? Life is mean and life is tough but never let your guard down, not even once.
Life is to short, tomorrow holds no promises, if it's meant to be, it be will be.
Life is a battle not to be won, life is a battle for everyone.
Life can be cruel and life can be fun, it's all how you make it, this outta be fun.
Life is about meaning and memories, not just one. 
Life is tough and can be rough but hold on to your life, for one day, you won't have one!
Is life really a riddle?