The point of life isnt hapiness, it is to dominate. Being able to dominate, brings happiness in return tho. So make sure you understand the right order. To dominate you have to be a function, to learn and excel at something. If you excel at differents things you re will be even more fulfiled. Whatever what you do if you dominate or excel at at least one thing, you ll be useful to others and able to adapt and survive, you ll be able to do the same thing over and over again and get what you need in return.
This is why anyone can be happy, and this is why spoiled rich people with no occupations kill themselves even if they re rich.
In the end, you lose everything anyways, but if you have someone to teach your knowledges to, then you die happy.