Become more and more centered in the Self. To live more and more in the thought that God is here in your consciousness.
The mastery of any subject requires that one identify himself with the particular state of consciousness appropriate to that subject.
It's not insincere to say you're happy if you're determined to make it true and live in that consciousness.
The thing is that the ego cannot cure itself of its own malady of egoism; it's already infected by the disease itself. And that is why it is necessary to go to a guru who knows God and by absorbing his consciousness into yourself, you discover that you aren't this ego. You cross that abyss and you find that you are infinite.