Happiness depends on conditions being perceived as positive it’s in essence a brief experience of joy and pleasure which quickly fades away. What your looking for is inner peace.
Realize deeply that the present moment is all you have. Make the NOW the primary focus of your life; The primary cause of unhappiness is never the situation, but thought about it. Be aware of the thoughts you are thinking. Separate them from the situation, which is always neutral. It is what it is.
What helped me understand this is the power of now book by Eckhart Tolle. I am actually doing a Book Club now sharing excerpts from the book I found helpful! CLICK HERE To read more
If you are interested in the book itself click HERE