A few things that I'll mention here; and this might sound strange.
Do you watch porn or masturbate?
This is a huge problem for many people, as we lose our energy when we release, and on top of that. We have to go through an intensive process to reproduce our semen, which takes a tremendous amount of energy, vitamins, minerals, nutrients. Everything the body needs to function correctly and more so specifically, your brain's minerals that it would otherwise use for behavior chemicals, etc.
I was very unhappy for most of my life until I learned about this, and eventually stopped. This single thing gave me my life back.
2. Your diet and environment might be affecting you as well. Pay close attention if you are not already.
3. Try Yoga.

Everyone else doesn't love themselves either, and most people are just superficially happy. Not existing in true happiness. Seems like this is the darkness that you're needing to attain a comprehension of light. It's a natural process too, to feel like this before you find your happiness.
There are other existences that are very fulfilling, which are waiting for you if you choose to explore them.
Life is not pointless, it's just a matter that we get lost along the way before we find ourselves.
I spent my entire life like that, not knowing that what I was searching for was inside of me. Self love.
Take care friend.