Aside from other recommendations here, think about volunteering in some hands on area like a street kitchen, or outreach to homeless people. Firstly because you will gain from the physical activity and a degree of unquestioned gratitude for small acts.

Secondly because contact either with or for people at the end of their rope in stronger sense of risk due to poverty will put your own concerns into focus. Not that you aren't unhappy, but that your unhappiness has relativity to other people's problems.

Thirdly because you'll be meeting interesting people of all kinds.

Fourthly because they need the help. So even if you don't secure the benefits I propose, at least they will, despite your unhappiness.

It's wrong to diagnose online, and I'm not an MD but your comments could suggest one of the anxiety-depression spectrum of problems which are treatable, and non drug regimes like CBT are surprisingly effective. Be the best kindest person you can be and you may find this alienation and dissatisfaction eases. Seek professional help.

Btw this kind of volunteer work is hard. Dirty. Confronting and may make you feel worse. Nothing is perfect.