what is contentment?
Do they differ from one another?
I believe they do and I don't think I have ever experienced happiness but I think I've managed to reach contentment in later life.
I think that if you suffer from depression that's an issue but I also suspect that if you take medication for that, as I do, it meddles with 'normal' emotions.
Also, what in life would make you happier or more content?
I have to say that having spent most of my life struggling financially, money helps a lot.