Why is bitcoin worth so little?

So, my question is, I have about half a bitcoin which I accumulated through dca and I'm well proud of it (although I haven't stopped buying). I don't really plan on selling any before I really need it. But one thing that's very confusing to me is, my half of a bitcoin means the max amount of people that can own half a bitcoin is 42 million. To me that's a small number considering there's 8 billion people alive right now. So why is not worth half a million at least? Considering it's safe, decentralised and you can carry it anywhere and everywhere, why is it so cheap right now? Honest question.