"No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon."(Matt 6: 24)
Elder Uchtdorf used to say: Misery is the love of wrong things, happiness is the love of right things.
Thus, the pursuit of happiness (which can result in happiness only when we are already happy!) is less worthwhile than the pursuit of ethics, morality, and righteousness--which anchor us such that happiness will know where to find us.
All you need is the right kind of love.