I've become incredibly self-aware and am now suffering existential dread. Everybody thinks I'm fine but really I feel like I'm going insane.
How do you feel about this?
Terrible. Nobody to talk to about these issues since everyone around me has a very narrow scope of interest and doesn't really care.
If you feel like people around you can't understand what you're going through, then you should reach out to a professional and get some help. If you don't you may become more and more detached from  others and continue to suffer in silence.
I'm not fine. No one understands me. I'm going to be alone forever...
Then get help as soon as possible. You should not try to tackle this alone.