It all depends on what we define as happiness. Epicurus said that happiness is just a lack of suffering. If we agree on his definition, then I'm happy and have been constantly happy for the last 5 years. If we define happiness as euphoria of sorts, well that I have never been happy all my life. Still for me this is all just "words, words, words" I couldn't care less if I'm happy or not.
BTW - a lot of people here mentioned that life can be meaningless. What does that exaclty mean? What is the difference between a meaningfull and meaningless life?
People often speak about life having a "purpose" or some "higer sense" in it, but they almost never explain what they mean by that "purpose". For me this is all bogus.