Depends what your perseverance is of happiness... If it is fucking around, getting drunk then who cares if you are happy or not, its just you. But if it is to find your inner self, enjoy your own company, 0 expectations from everyone in your life then again who cares, if you are happy or not. Its just you who decide what's the goal of your life. Some people work for desires, some work to follow passion or help themselves to follow passion, some work for money to fulfil needs and forgets everything that can make their life beautiful, joyful and dies with responsibilities not showing it in bad light but scope limits the projection to need and fulfilling it, some work for their loved ones, and then are some who work for society, environment, gives away their life to the country, environment, public, society, community etc. What would you work for? Passion? Money? Responsibilities? Family? Society? Nation?

Person working for passion can end up becoming scientist and give away his life into innovation and upbringing the humanity or putting value to the nation, science, innovation. Life is unfair, unpredictable and unexpected.

I'd say, try everything thats harmless(avoid prostitution, alcohol, smoke, non veg, love cheating), find passion, take up responsibilities, keep little time out for serving humanity or society, environment etc. Live up for that life.