Fussing about happiness being a bunch of chemicals in the brain and objectifying it makes it something it's not. I am well aware of the science behind it- there's science behind everything we feel and do. But that doesn't mean we should detach ourselves from our emotions just because they're chemical reactions. We all need our feelings-- they go hand in hand with our instincts and guide our actions/ define who we are. While it may be hard to deal with the harder emotions, learning to confront sadness and depression is a great way to mature and build character. If you really want to be happy, stop and think about how you will be the happiest in the years to come and if your happiness is what matters the most to you. If you see nothing but suffering and still want to commit suicide, think again about how the people who may love you will feel after you've passed away. That suffering, to them, may be worse than death itself. Suicide is the ultimate selfish act someone can commit. You would be better off exercising new options for your future and trying to find some other meaning to your life. Where you may not find meaning in your life from happiness, your search for meaning may be all the meaning you need. I've personally found that there's a lot to my life apart from the ways I've been spending it for the past 21 years in my more recent endeavors.
Anyways, I don't mean to lecture anyone. Your life is your own and you are the one who decides what to do with it. While others may influence how you live they hold no true sway over your actions and words.
/me tries to be insightful