you have to understand that as a man, if you dont find a purpose you will never feel satisfied for a moment in your life. you are a worker, a fish in a school, a wolf in a pack, going off and doing your own thing serves only you, and living selfishly as a member of pack species can never end in contentment and satisfaction. you need to carry something, specifically so that someone you care about doesn't have to. otherwise you are sitting there, watching, while they carry everything, including you. why would you deserve to be happy if you aren't carrying your weight? evolution would never allow that.
if our species felt content with sitting and doing absolutely nothing, then people since the beginning of our species would have done only that, and we'd likely not have lasted very long. but if by some miracle we lasted up until today, we'd still be living in caves and eating bugs. people require a lot more than eating, sleeping, and shitting, to feel good. we are much more complex than that. we are wired to feel good when we are doing things that help the pack. we cannot worry about making ourselves happy. you must make the pack happy, and in doing that, the feeling of emptiness you've always sat with will flee from you.
you will understand that that feeling of emptiness was actually a feeling of uselessness and inadequacy. if you claim to be depressed, but you're spending 5 hours a day playing video games and the rest of the day scrolling through videos on your phone, you're not depressed. you're just useless. and im not being harsh, im stating a fact.
people like this also tend to feel loads of anxiety as well on top of all this. this can also be easily explained. your body is reacting with fear constantly because you are not sure of yourself. the only way you can become sure of yourself is to prove to yourself that you don't completely fuckin suck, and you can't lie to yourself because you were there the whole time.
if you want to feel good you have to earn it. being content is not something given out freely to everything that breathes.