A good way of figuring out what you value is considering if you die tomorrow, why wouldn't you (assuming you aren't suicidal). If you really don't matter either way then why not just do the thing that feels good?
I think if I could afford it I would probably be a habitual heroin user. From what I read, it seems to push all of the same biochemical "happiness" and "fulfillment" buttons as all of the other relationship/activity/experience things that people like to do, albeit with some side effects.
On the other hand, if you're stuck in a shithole with a metric tonne of inner demons, it's pretty much tops.
Contentment, opiates. Happiness... like that innocent 'AHHHHH TOMORROW'S CHRISTMAS!' joy, I'd say MDMA instead