I analysed 20 years of my chats

Relationships are inherently transactional. You won't want to spend time with someone if you don't get something out of it, barring certain unconditional loves like your immediate family. When making new friends, proxies like attractiveness and social standing are how people judge if someone is likely to add value to their lives or not.

So yes, unfortunately, if you talk to someone and you're just some small quiet guy with no interesting characteristics, you'll probably be written off before you get a chance to develop a friendship with them. Whereas if they see you have muscles, or know you're successful in your career, or know you have other friends, they'll be more likely to assume you might be worth getting to know.

Things like working out, dressing well, learning to speak well, etc. all help. However, there is an alternative shortcut to building close friendships - forced interaction. When you're stuck sitting next to someone in class for a year, you don't have the privilege of swapping that person out for someone who seems cooler, you just have to get to know them. When you're stationed in the military with a squad you don't get to swap that squad out for people you think you might like more, you just bond with them. But there are few opportunities like that in normal life, you have to seek them out. Go on a 2 week long canoeing expedition, join a start-up incubator with a small team, play an MMO at a competitive level where you have scheduled runs and are in voice chat. Do stuff that forces you to interact with people for a long time and puts you in environments where you can't just leave and seek out people more like you.

You might need some hobbies which are more social, like volunteering. It's very easy to fall into work -> hacking at stuff -> sleep cycle, but you can't live inside your own head for the rest of your days.

I'm older and I've lived through the analog era, before people had cell phones or internet. Facebook wasn't around when I graduated from college, so most contacts from before that withered away -- especially if you ended up living in a different state or city.

It is sometimes heart wrenching to hear about people from your past, knowing that you didn't keep in touch. A girl that I went to elementary school with, always kind of an odd girl (but in a good way), developed leukemia in her 30s and passed away in 2019. I didn't know for seven years. Seven! I went through her Facebook page and it was a roller-coaster of emotions, playing her life backward as she chronicled her condition worsening, periods of hope, all the way back to when she was saying that she had some kind of bug and felt awful.

She was a good friend to me in elementary school, but we ended up going to different high schools and different directions after that. I feel bad that we didn't keep in touch, and that I was completely unaware of her suffering.

I can't wallow in this, though, and this is where I'm attempting (maybe poorly) to make a connection to your situation. You can't change the past, but you can start making meaningful attempts to forge new relationships and to rekindle old ones. Those people that you never kept in touch with? Reach out to them, if only to say "Hi". Reach out because you want to do it, and not because you need something.

How many days will you sit there and think "why doesn't anyone reach out to me?" when you, yourself, are not also making the effort to do so?

But for normal people, the biggest risk is companies using their chats to train models / dispatch ads etc to which the only solution is E2EE.