Are you happy with your life?
Whether you are experiencing astonishing success in love and career or you feel lonely and desperate, your answer to this question depends on who (or what) you compare to. So, Are you happy compared to your friends' lives? Are you happy compared to your high-school years? Are you happy compared to what you expected from your life 5 years ago?
I have just read a great book with the title "The Paradox of Choice - Why more is less" by Barry Schwartz. It is all about the amount of choice consumer have these days. And guess what: the more choice you have the more difficult it is to choose. Too much doesn't mean good. And whatever you choose makes you feel unhappy because you are missing many alternatives. Is there a solution? Fortunately, yes: make your choice and stick with it.
Never look back.
My personal answer to the initial question is
I don't know if I am happy or not, I just know that I wouldn't change my life with anyone's else. I stick with my life even if sometimes I feel unhappy.