I have a ridiculous amount of interest I could share. I will take your advice and see if I can find people who share those interest! I will also try and change my thoughts. It’s just hard to not feel like the world is closing in when it feels like nobody acknowledges your existence.
Why do you care if people acknowledge your existence?
Some people would love that and see it as a super power. Lots of interesting things going on in the world to explore, you should consider that what you think is the issue is not the answer, it has enough of it's own problems. People are annoying and get in the way of enjoying many things. Go enjoy life and stuff first, your 19, plenty of time to find friends along the way.
I think there's some good advice on this thread. Your issue definitely resonates with me, college was very lonely for me as well. HN itself doesn't lend itself to continued conversation (long threads lose their [reply] button and repeated postings from new accounts can turn automatically comments [dead], as in your case). You don't have an email posted, but you can –if you want– message mine. Just say "From HN", or whatever! I (internet rando) would like to talk to you.
Drop me a line if you would like to talk. Email is in the profile.
This is called catastrophizing. https://www.psychologytoday.com/us/basics/catastrophizing
If you take nothing else away from my comment, I would suggest finding out why you do that, and try to change that mental behavior. It might not directly help with loneliness, but it might make your life more satisfactory.
That said, while other folks on HN will have some advice you'll find useful, I'm not sure how applicable my experiences are to anyone else. My advice would be to examine the things you're interested in, especially if they're weird or "cringe", and find people who share those interests. Be shamelessly authentic.
If you don't have any such interests, I dunno.